Majority Leader John Thune (R-South Dakota) conceded early Tuesday that he did not know if he had the votes yet to pass the measure.

With Sens. Rand Paul and Thom Tillis opposed to the package, GOP leaders can afford only one more defection. And multiple Republicans aren't yet sold on the measure.

Vice President JD Vance has arrived at the Capitol as senators slog through a tense overnight session on President Donald Trump’s big bill of tax breaks and spending cuts