The Senate is taking a key procedural vote that has dragged on for more than two hours during a rare Saturday evening session as Republicans struggled to advance President Donald Trump’s package of tax breaks, spending cuts and bolstered deportation funds by his July Fourth deadline, Associated Press reported.

The proceedings came to a standstill and Vice President JD Vance arrived at the Capitol to break a potential tie. Tense scenes were playing out in the chamber as senators huddled in negotiations. Several Republican senators were registering their opposition to proceeding to open debate on the bill.

Republicans are using their majorities in Congress to push aside Democratic opposition, but they have run into a series of political and policy setbacks. Not all GOP lawmakers are on board with proposals to reduce spending on Medicaid, food stamps and other programs as a way to help cover the cost of extending some $3.8 trillion in Trump tax breaks.

“It’s time to get this legislation across the finish line,” said Senate Majority Leader John Thune, R-S.D., as the session was underway, according to Associated Press.