The Republican-controlled U.S. Senate advanced President Donald Trump's sweeping tax-cut and spending bill in a key procedural vote late on Saturday, raising the odds that lawmakers will be able to pass his "big, beautiful bill" in the coming days.

The measure, Trump's top legislative goal, passed its first procedural hurdle in a 51 to 49 vote, with two Republican senators voting against it.

The result came after several hours of negotiation as Republican leaders and Vice President JD Vance sought to persuade last-minute holdouts in a series of closed-door negotiations.

The procedural vote, which would start debate on the 940-page megabill to fund Trump's top immigration, border, tax-cut and military priorities, began after hours of delay.

It then remained open for more than three hours of standstill as three Republican senators - Thom Tillis, Ron Johnson and Rand Paul - joined Democrats to oppose the legislation. Three others - Senators Rick Scott, Mike Lee and Cynthia Lummis - negotiated with Republican leaders into the night in hopes of securing bigger spending cuts.

In the end, Wisconsin Senator Johnson flipped his no vote to yes, leaving only Paul and Tillis opposed among Republicans.

Trump was monitoring the vote from the Oval Office late into the night, a senior White House official said.

The megabill would extend the 2017 tax cuts that were Trump's main legislative achievement during his first term as president, cut other taxes and boost spending on the military and border security.

Nonpartisan analysts estimate that a version of Trump's tax-cut and spending bill would add trillions to the US$36.2-trillion U.S. government debt.

Democrats fiercely opposed the bill, saying its tax-cut elements would disproportionately benefit the wealthy at the expense of social programs that lower-income Americans rely upon.

Chuck Schumer, the Senate's top Democrat, demanded that the bill be read aloud before debate could begin, saying the Senate Republicans were scrambling to pass a "radical bill".

"If Senate Republicans won't tell the American people what's in this bill, then Democrats are going to force this chamber to read it from start to finish," the New York Democrat said.

(Reuters)

Trump's sweeping tax-cut, spending bill clears first US Senate hurdle