Republican leaders push to secure final votes on Trump's megabill. Here's what's in it

Sen. Lisa Murkowski, R-Alaska, a member of the Senate Appropriations Committee and a key swing vote on the budget reconciliation package, leaves the chamber on Monday as Republicans plan to begin a final push to advance President Donald Trump's big tax breaks and spending cuts package. (AP Photo/J. Scott Applewhite)

The fate of the sweeping GOP tax and spending bill hangs in the balance as senators continue to work on amendments and closed-door negotiations Tuesday morning following an all-night session.

Senators slowly worked their way through dozens of amendments as GOP holdouts met with Senate Majority Leader John Thune, R-S.D., both on the floor of the Senate and in his private office in the Capitol. The talks—and amendments—show few signs of ending.

Eyes are on Sens. Lisa Murkowski, R-Alaska, and Susan Collins, R-Maine, as two potential holdouts on the bill. Sens. Thom Tillis, R-N.C., and Rand Paul, R-Ky., already oppose the bill, meaning Republicans can only afford to lose Collins or Murkwoski if they hope to pass the bill—and even then Vice President JD Vance would be needed to break a tie.