Trump admin updates: Trump says tariff letters to be sent to 'various countries' on Monday

The Senate vote-a-rama has been going on for nearly 19 hours. Senators are now seated at their desks on the floor, some with weary faces, others wearing blankets and fuzzy socks -- and many drinking coffee.

There is still no clear indication as to when the session will come to a close or when the Senate will proceed to a final vote.

The Senate just completed voting on an amendment by Sen. Mike Lee that aimed to strip out wind and solar tax credits from this bill. It failed by a vote of 22-78. Lee's amendment was closely watched partially because members of the House Freedom Caucus wanted it to pass.

Lee's amendment was the 33rd vote that the Senate has taken in this vote-a-rama. There are, at present, three more votes queued up. Aides told ABC News those next votes will not be the last of the session, but it is not unclear how many more may follow.

Majority Leader Sen. John Thune has now asked his colleagues to keep the next round of votes to 10 minutes each. The longer this goes, the faster we expect senators to vote.

-ABC News' Allison Pecorin

President Donald Trump responded to Elon Musk's criticisms of the "One Big Beautiful Bill" on Truth Social early Tuesday, suggesting he could direct DOGE to probe subsidies awarded to the billionaire's companies.

In recent days, Musk has criticized Trump's megabill as an "utterly insane" piece of legislation that will "destroy millions of jobs in America and cause immense strategic harm to our country!" Musk has also threatened to support primary campaigns against lawmakers who back the bill.

In response, Trump said early Tuesday that Musk "may get more subsidy than any human being in history, by far, and without subsidies, Elon would probably have to close up shop and head back home to South Africa."

"No more Rocket launches, Satellites, or Electric Car Production, and our Country would save a FORTUNE," Trump wrote. "Perhaps we should have DOGE take a good, hard, look at this? BIG MONEY TO BE SAVED!!!"

The president also said Musk "knew, long before he so strongly Endorsed me for President, that I was strongly against the EV Mandate. It is ridiculous, and was always a major part of my campaign. Electric cars are fine, but not everyone should be forced to own one."

-ABC News' Alex Ederson

Sen. Susan Collins blamed Democrats for tanking her amendment to boost the GOP megabill's rural hospital relief fund.

She called Democratic senators "hypocrites" for claiming to care about protecting Medicaid and then voting against her efforts to lessen the impacts of the "One Big Beautiful Bill" on hospitals in rural areas.

"I was surprised at the hypocrisy of the Democrats on it, had they voted for it would have passed easily," Collins told reporters after the vote early Tuesday morning.

Georgia Sens. Jon Ossoff and Raphael Warnock were the only two Democrats out of 22 senators who supported Collins' amendment.

"They complained repeatedly about the distribution in this bill of Medicaid cuts, hurting individuals in rural hospitals and tax cuts being extended for people who are wealthy. And yet, when we tried to fix both those problems, They took a very hypocritical approach," Collins said.

Collins said the outcome of this amendment would have "absolutely no impact" on her decision to support the bill's final passage, however.

It's still unclear how Collins will vote. "We'll see what the final bill looks like," she said.

-ABC News' Isabella Murray

Many Democratic senators voted with the majority of their Republican colleagues to block an amendment by Sen. Susan Collins that aimed to increase the amount of money in the rural hospital relief fund.

Republicans created the fund to address concerns from moderates that the cuts to Medicaid in President Donald Trump's "One Big Beautiful Bill" would negatively impact rural hospitals in some states.

Collins' amendment would have increased the tax rate on individuals earning over $25 million and couples earning over $50 million in order to pay for a $25 billion bump to the rural hospital fund. It failed by a vote of 22-78.

"When these facilities close their doors the people they serve are often left behind without access to health care," Collins said. "This amendment would help keep them open and caring for those who live in these rural communities. The additional funding is fully offset through a modest increase in the top marginal tax rate."

Democrats voted against the bill arguing that it is a "Band-Aid on an amputation."

"It provides just a tiny fraction of the nearly $1 trillion in cuts the bill makes to Medicaid," said Sen. Ron Wyden, the top Democrat on the Senate Finance Committee.

"It would be much more logical to simply not cut $1 trillion from Medicaid in the first place," Wyden said. "This amendment doubles down on that flawed plan that's going to set rural hospitals adrift."

The rejection of the amendment puts Collins' already tenuous vote on final passage in further danger. She signaled over the weekend she may not support the bill if her concerns about rural hospitals weren't addressed during the amendment process.

If Collins casts a vote against the package, it could spell problems for the GOP leadership which can only afford to lose three Republicans when the goes to a final vote.

Sens. Thom Tillis and Rand Paul are already expected to vote against the bill. Collins is part of a group of several Republican senators whose support is still uncertain as of the early hours of Tuesday morning.

-ABC News Allison Pecorin and Isabella Murray