House Republicans pushed through a spending plan early Sunday morning that would delay the Affordable Care Act for one year and repeal its tax on medical devices.
The vote makes the chances of a government shutdown Tuesday increasingly likely. That's because passage of the amendments sends a temporary budget resolution back to the Senate, where Democrats are standing firm in support of the Affordable Care Act.
President Barack Obama has added a veto threat to that position.
Without a deal, a government shutdown will begin at 12:01 a.m. Tuesday.
A Senate Democratic source told CNN there are no plans to convene the Senate before Monday.
The decision to vote on the House amendments Saturday night emerged from a rare weekend GOP caucus meeting called by House Speaker John Boehner.
The votes, taken after midnight, were 231-191 for the the Affordable Care Act delay, and 248-174 for the medical device tax repeal, mostly along party lines.
Two Democrats voted for the delay: Mike McIntyre of North Carolina and Jim Matheson of Iowa.
Seventeen Democrats voted for the tax repeal.
Meanwhile, a bill to guarantee pay for military personnel during any shutdown passed 423-0.
Back and forth
Senate Majority Leader Harry Reid called the Republican strategy "pointless" and said the Democratic-led Senate would reject the GOP alternatives, while the White House said Obama would veto the House proposal if it reached his desk.
A separate White House statement said voting for the GOP measure "is voting for a shutdown."
The back and forth over the spending plan -- called a continuing resolution in legislative jargon -- came after the Senate on Friday restored funding for Obamacare that House Republicans stripped from their original version and sent the proposal back to the House.
Boehner convened his caucus Saturday to forge a counteroffer to the Senate changes.
House Republicans said they wanted the following:
-- An amendment that will fund the government until December, a month longer than the Senate version.
-- Stop as much of the president's health law as possible.
-- Repeal the medical device tax because they said it was sending jobs overseas.
-- A "conscience clause" to the one-year delay amendment to allow employers and insurance plans to refuse to cover birth control.
Military pay in a shutdown
Showing that the House Republicans don't expect the Senate to accept their changes, House leaders held a separate vote to ensure that the military gets paid in the event of a government shutdown.
Officials estimate the military pay could be affected by a shutdown as soon as October 14, and the GOP move was considered a political gesture to shield the party from criticism that its brinksmanship could hurt U.S. fighting forces.
In further evidence of the political nature of the separate military pay proposal, Democratic Rep. Chris Van Hollen of Maryland said Democrats would likely support it.
On the spending plan, though, Reid said the Republican tactics amounted to what he described as extortion by "tea party anarchists."