WASHINGTON — As the government teeters on the brink of a partial shutdown, congressional Republicans vowed Sunday to keep using an otherwise routine government-funding bill to try to attack “Obamacare.”

Congress was closed for the day after a post-midnight vote in the GOP-run House to delay by a year key parts of the new health care law and repeal a tax on medical devices, in exchange for avoiding a shutdown. The Senate is slated to convene Monday afternoon just hours before the shutdown deadline, and Majority Leader Harry Reid, D-Nev., has already promised that majority Democrats will kill the House’s latest volley.

Since the last government shutdown 17 years ago, temporary funding bills known as continuing resolutions have been noncontroversial, with neither party willing to chance a shutdown to achieve legislative goals it couldn’t otherwise win. But with health-insurance exchanges set to open Tuesday, tea party Republicans are willing to take the risk in their drive to kill the health care law.

The action in Washington was limited mainly to the Sunday talk shows and barrages of press releases as Democrats and Republicans rehearsed arguments for blaming each other if the government in fact closes its doors at midnight Monday.

“You’re going to shut down the government if you can’t prevent millions of Americans from getting affordable care,” said Rep. Chris Van Hollen, D-Md.

“The House has twice now voted to keep the government open. And if we have a shutdown, it will only be because when the Senate comes back, Harry Reid says, ‘I refuse even to talk,'” said Sen. Ted Cruz, R-Texas, who led a 21-hour broadside against allowing the temporary funding bill to advance if stripped clean of a tea party-backed provision to derail Obamacare. The effort ultimately failed.

The battle started with a House vote to pass the short-term funding bill with a provision that would have defunded implementation of the health care overhaul. The Senate voted along party lines to strip that out and lobbed the measure back to the House. The latest House measure, passed early Sunday by a near party-line vote of 231-192, sent back to the Senate two key changes: a one year-delay of key provisions of the health insurance law and repeal of a new tax on medical devices that partially funds it, steps that still go too far for The White House and its Democratic allies on Capitol Hill.

Senate rules often make it difficult to act quickly, but the chamber can act on the House’s latest proposals by simply calling them up and killing them on a non-debatable motion.

Eyes were already turning to the House on Sunday for its next move. One of its top leaders vowed it would not simply give into Democrats’ demands to pass the Senate’s “clean” funding bill.

“The House will get back together in enough time, send another provision not to shut the government down, but to fund it, and it will have a few other options in there for the Senate to look at again,” said the No. 3 House Republican leader, Rep. Kevin McCarthy of California. “We are not shutting the government down.”

Republicans argued that Reid should have convened the Senate on Sunday to act on the measure.

“If the Senate stalls until Monday afternoon instead of working today, it would be an act of breathtaking arrogance by the Senate Democratic leadership,” said House Speaker John Boehner, R-Ohio. “They will be deliberately bringing the nation to the brink of a government shutdown.”

In the event lawmakers blow the Monday deadline, about 800,000 workers would be forced off the job without pay. Some critical services such as patrolling the borders, inspecting meat and controlling air traffic would continue. Social Security benefits would be sent and the Medicare and Medicaid health care programs for the elderly and poor would continue to pay doctors and hospitals.

— Andrew Taylor, Associated Press