WASHINGTON (TNND) — The Senate is still in the midst of a marathon voting session on Tuesday morning as it works to make amendments to President Donald Trump's “One Big Beautiful Bill Act."

Senators convened at 9 a.m. on Monday for a "vote-a-rama," providing an opportunity for Republicans to secure support for Trump while Democrats work to defeat the budget bill.

The Senate version of the bill would roll back billions of dollars in green energy tax credits, which Democrats warn will wipe out wind and solar investments nationwide. It would impose $1.2 trillion in cuts, largely to Medicaid and food stamps, by imposing work requirements on able-bodied people, including some parents and older Americans, making sign-up eligibility more stringent and changing federal reimbursements to states.

Additionally, the bill would provide a $350 billion infusion for border and national security, including for deportations, some of it paid for with new fees charged to immigrants.

Senate Majority Leader John Thune told reporters at around 4:30 a.m. "we're close," adding they still have "a few amendment votes" until final passage.

Republican senators have adopted three amendments to the bill so far, according to CNN.

1. Sen. Joni Ernst offered an amendment to bar federal funding from being used by unemployment benefits for people whose wages are at least $1 trillion
2. An amendment from Sen. Marsha Blackburn strikes language from the bill that would have blocked state and local governments from enforcing their own artificial intelligence regulations for 10 years
3. Sen. John Kennedy introduced an amendment to move up the eligibility verification requirement for Medicaid by one year

Vice President JD Vance arrived at the Capitol in case he is needed to break a tie vote. Republicans can lose no more than three votes if they hope to pass the bill by Trump's Fourth of July deadline.

In a midnight post on Truth Social, the president urged senators on by calling the bill "perhaps the greatest and most important of its kind.”

Meanwhile, House Speaker Mike Johnson signaled more potential problems ahead, warning the Senate package could run into trouble when it is sent back to the House for a final round of voting.

However, not all GOP lawmakers appear to be on board as the final package emerges in the House and Senate.

Over the weekend, Trump lashed out against the holdouts, even threatening to campaign against one Republican, Sen. Thom Tillis of North Carolina, who had said he could not support the bill because of Medicaid cuts that could leave many in his state without health care.

Sen. Rand Paul, who opposes raising the debt limit by $5 trillion, also indicated opposition.

On Sunday, Tillis said he would not be seeking reelection, vacating a seat that creates a political opportunity for Democrats in the 2026 midterm election. Currently, Republicans hold a 53-47 advantage in the Senate.

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Editor's note: The Associated Press contributed to this article.