United States House Speaker Kevin McCarthy is facing renewed pressure from both Democrats and Republican partymates after averting a federal government shutdown over the weekend with a 45-day stopgap funding law.

US President Joe Biden on Sunday called on McCarthy to avoid another shutdown drama when the 45-day stopgap deal agreed on Saturday runs out.

"I'm sick and tired of the brinksmanship," Biden said, speaking from the Roosevelt Room at the White House.

"The brinksmanship has to end. There shouldn't be another crisis."

Biden made the call as he assured Ukraine that the US will not abandon it.

An 11th-hour deal by Congress late Saturday contained no new war-time aid for Ukraine as part of a compromise between Republicans and Democrats.

"I want to assure our American allies, the American people and the people in Ukraine that you can count on our support. We will not walk away," Biden said in an address from the White House.

Meanwhile, leading hardline Republican Congressman Matt Gaetz said Sunday he would move to oust McCarthy for striking the deal that was without the spending cuts demanded by the right-wing caucus.

"I do intend to file a motion to vacate Speaker McCarthy this week," Congressman Matt Gaetz told CNN.

"I think we need to move on with new leadership that can be trustworthy," Gaetz added, but acknowledging that the speaker may retain his post if Democrats bail him out.

In addition to Democratic support, pro-McCarthy Republicans will work to prevent his ouster.

Republican Mike Lawler told ABC's "This Week" on Sunday that "the only responsible thing to do was to keep the government open and funded while we complete our work."

"By putting this motion to vacate on the floor, you know what Matt Gaetz is going to do? He's going to delay the ability to complete that work over the next 45 days," Lawler said.

If Congress had failed to keep the government open, the closures would have begun just after midnight (0400 GMT Sunday) and would have delayed salaries for millions of federal employees and military personnel.

Among other immediate effects, the majority of national parks would have been shuttered to the public from Sunday.

The stopgap measure buys legislators time to negotiate full-year spending bills for the rest of fiscal 2024.

WITH AFP