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The two men then sat down in navy-and-gold armchairs in an opulent, sunlit building with marble columns. Mr. Trump was accompanied by Secretary of State Marco Rubio and Defense Secretary Pete Hegseth, among others.

Prince Mohammed’s presence signified the special status that Mr. Trump enjoys with Saudi Arabia. When President Biden visited in 2022 — he vowed to make the kingdom a “pariah,” before realizing he needed its help to lower oil prices — the crown prince snubbed him, sending a relatively low-ranked delegation to greet him at the airport.

It is highly unlikely that Mr. Trump will feel disrespected on this trip, which will also include stops in Qatar and the United Arab Emirates.

Mr. Trump will be focused on signing business deals with the three countries, which manage trillions of dollars in assets around the world. He has told advisers he wants to sign agreements worth more than $1 trillion. Deals are expected to include investments in artificial intelligence companies and energy production, as well as multibillion-dollar arms purchases from U.S. weapons manufacturers.

Here’s what else to know:

• Trump address: The president is scheduled to speak on Tuesday afternoon at an investment forum hosted by the Saudi government. The White House crypto czar, David Sacks, and other American business leaders — including the chief executives of IBM, BlackRock, Citigroup, Palantir and Nvidia — are expected to attend.

• Family interests: The president’s trip neatly tracks with the financial interests of his family. The Trump administration is also poised to accept a luxury Boeing 747-8 plane, described as a “flying palace,” as a donation from Qatar’s royal family in what could be the biggest foreign gift ever received by the U.S. government.

• Food stamps: In Washington, House Republicans on Monday proposed a series of sharp restrictions on the federal anti-hunger program known as food stamps. Millions of low-income families could potentially lose access to the program.

Maggie Haberman contributed reporting.

Mr. Piker, who was born in the United States, said he was passing through Global Entry, a U.S. Customs and Border Protection program that eases security checks for travelers deemed to be low-risk, when an agent asked him to step aside.

According to Mr. Piker, a U.S. Immigration and Customs Enforcement agent led him to an area that he described as a “detention center,” where he was taken into a room for questioning.

“It’s very obvious they knew who I was,” Mr. Piker said, using an expletive.

Mr. Piker has about 4.5 million followers combined on YouTube and Twitch. His fluency between culture and ideology has led many to brand him a Joe Rogan of the left.

Tricia McLaughlin, a spokeswoman for the Department of Homeland Security, said in a statement on social media that Mr. Piker’s “claims that his political beliefs triggered the inspection are baseless.”

“Upon entering the country, this individual was referred for further inspection — a routine, lawful process that occurs daily, and can apply for any traveler,” she said. “Once his inspection was complete, he was promptly released.”

Mr. Piker described the conversation as “really, really interesting” and “very cordial.” He said the agent asked him what he did for work, the topics he talked about in his streams and whether he discussed the news, including the war in Gaza and President Trump.

“They straight-up tried to get something out of me that I think they could use to basically detain me permanently,” Mr. Piker said, using an expletive again. “There is no direct connection or direct involvement.”

Mr. Piker also described the agent, who identified himself as Iraqi, as “very sympathetic.” When he asked the agent why he was being detained, Mr. Piker said the agent told him it was “routine.”

He said he was also repeatedly asked about his opinions on and whether he was involved with Hamas, the Houthis, an Iranian-backed militant group that controls northern Yemen, and Hezbollah. Throughout the questioning, Mr. Piker said he was transparent in his responses and repeated the same answers, including describing himself as a “pacifist” who wanted wars to end.

In his broadcast, Mr. Piker said he planned to submit an online inquiry about why he was stopped.

The moves could result in potentially millions of low-income families losing access to the safety net program. But G.O.P. leaders insist that their approach would improve the provision of food stamp benefits while helping to defray the cost of Mr. Trump’s expensive legislative ambitions.

House Republicans said in a statement on Monday that their proposal emphasized “reinforcing work, rooting out waste, and instituting long-overdue accountability incentives to control costs and end executive and state overreach.”

The Republican overhaul specifically targets the Supplemental Nutrition Assistance Program, known as SNAP With a roughly $110 billion annual budget, it is the federal government’s largest nutrition assistance initiative, providing monthly allotments to an average of 42 million people in the 2025 fiscal year, according to the most recent data from the U.S. Department of Agriculture, which manages the program.

Proponents of the food stamp program say that it has long served as a critical lifeline for low-income families by ensuring that they do not experience hunger in a nation where about one in seven reported food insecurity at some point during 2023, according to federal data released in September.

Republicans long have decried elements of SNAP, arguing that states have mishandled federal money in ways that have allowed people who should not qualify for the benefits to receive aid. Those concerns prompted Republicans to tighten eligibility for food stamps in 2023, primarily by requiring more adults to obtain employment in order to collect federal assistance.

Unsatisfied with the early results of those strictures, House Republicans on Monday took the first steps toward tightening them further.

As part of their forthcoming package to cut taxes and reduce federal spending, Republicans proposed expanding the existing work requirements to cover food stamp recipients up to age 64, including those with children who are at least age seven.

That amounts to a significant expansion of existing law, which currently only requires beneficiaries up to age 54 to work in exchange for SNAP, and excludes those with dependents. Studying similar Republican proposals in recent years, the nonpartisan Congressional Budget Office has estimated that work requirements and other rules could result in millions of enrollees losing access to the program. (The budget watchdog has not yet released an analysis on the party’s newest proposal.)

Republicans also proposed limiting nutrition aid to only U.S. citizens and green card holders. States would be required for the first time to contribute funding to the federal food stamp program beginning in 2028. And the Republican proposal would try to limit future administrations from boosting the benefits that low-income Americans receive in nutrition aid.

The Republican proposals are likely to anger congressional Democrats and anti-poverty groups, many of whom have pushed for more generous federal nutrition aid. Some states have also signaled in recent days that they may struggle to cover a share of the program’s costs, potentially further cutting into the availability of benefits.

“Slashing billions from SNAP would deepen hunger, increase poverty, and weaken communities,” said Crystal FitzSimons, interim president of the Food Research & Action Center, an advocacy group. “Instead of shifting costs to states — knowing that states cannot take these added costs on — and cutting SNAP, we must ensure access to the nutrition that everyone needs to thrive.”

These crypto investors had secured an invitation to the dinner even though their online wallets showed that they held zero of the memecoins, a type of novelty digital currency often based on a joke or mascot.

That is because of a quirk in the rules: The winners were selected based on the average number of coins they held during the three weeks the contest was underway rather than their total at the end of bidding.

Participants expected the price of the coin to crash as soon as the contest ended. And it did just that on Monday afternoon, plunging by 6.5 percent once the winners were announced. By that point, nearly 20 of the contestants had sold off or transferred all their $TRUMP holdings, according to an analysis by The New York Times.

These traders had managed to benefit from the surge in price driven by the contest’s promotion and still secure a seat at the dinner, set for May 22 at the Trump National Golf Club in Virginia.

That was not the plan. Mr. Trump and his partners, who control 800 million of the coins, stood to benefit if the price stayed high. So Mr. Trump had been urging people to buy the coins throughout the auction period, and his partners encouraged investors to keep holding them even after it ended.

The trading frenzy started on April 23, when a website associated with Mr. Trump’s coin announced the contest. The site said that Mr. Trump would attend a dinner with the coin’s top 220 holders, as well an “Exclusive Reception” with the top 25, who would also win a White House tour the next day. An arcade-style leaderboard tracked the rankings, allowing the crypto investors to see what they had to spend to make the cut.

The competition set off a surge of trading activity, as investors vied for a chance to meet with Mr. Trump and, in some cases, use that access to push for policies that would benefit the crypto industry.

But the contest was also an opportunity for rapid profit-taking by sophisticated traders.

One buyer purchased $2.2 million worth of the $TRUMP coin in early April, a couple of weeks before the contest started. By last Thursday, the account appeared to have sold it all, pocketing $957,779.25 on the flip. (The buyers were identified only by their chosen nicknames. This buyer was called “Noah.”)

But because that buyer’s account had so many coins early in the process, it was ranked 25th on the leaderboard, meaning whoever controls it should secure a dinner seat, as well as the White House tour.

The contest has drawn criticism from both Democrats and Republicans on Capitol Hill, as well as some ethics lawyers, who called it a corrupt moneymaking grab by Mr. Trump.

“I could never have imagined any leader of the United States engaging in this kind of grift,” Senator Jeff Merkley, Democrat of Oregon, said in an interview on Monday. “The White House and President Trump are selling access to the government and himself for personal profit.”

Particularly disturbing, he said, is that most of the contest winners remain anonymous and that many of them, based on the exchanges they used to purchase the coins, appear to be from overseas, while others have said publicly that they bought in to try to influence U.S. policies.

Mr. Merkley has introduced a bill that would ban any president, vice president or senior executive branch official and their family members from profiting from a crypto sale. He has also asked the Office of Government Ethics to investigate Mr. Trump’s role in the $TRUMP venture.

A White House spokesman did not respond on Monday to a request for comment on the contest or whether the White House tour would take place as planned. Last week, the White House press secretary, Karoline Leavitt, said the president acts with only the interests of the American public in mind and that he did not have a conflict of interest.

Overall, the winners of the contest held $182 million worth of the $TRUMP coins at the time the contest closed. They had spent $191 million to buy those coins, meaning that, in aggregate, the winners had lost more money on the purchases than they had gained, according to an analysis of public transaction data by The Times.

This is consistent with trading data that shows that most buyers of the coin since it was first introduced in January have lost money — a total of $3.9 billion, according to an analysis by Inca Digital, a crypto data firm.

Whether traders make or lose money, the Trump family and its partners get a transaction fee each time the coins change hands, earning at least $320 million since $TRUMP went on sale in January, according to an estimate by Chainalysis, an industry data analyst.

On Monday, the contest’s organizers seemed eager to stop the sell-off, presumably aware of the possibility that even more of the dinner guests might dump their coins now that the competition has ended.

In a post on X, the official account promoting the memecoin said that anyone who held onto their $TRUMP stash between now and the dinner would be rewarded with a “TRUMP DIAMOND HAND” nonfungible token — a type of digital collectible known as an NFT.

The account also announced that the coin’s holders would soon start earning “rewards points,” without explaining how points would be distributed or what they would be used for. By Monday evening, the price of the $TRUMP coin had inched up once again.