President Joe Biden said Sunday that American aid to Ukraine will keep flowing for now as he sought to reassure allies of continued U.S. financial support for the war effort. But time is running out, the president said in a warning to Congress, AP reported. 

“We cannot under any circumstances allow America’s support for Ukraine to be interrupted,” Biden said in remarks from the Roosevelt Room after Congress averted a government shutdown by passing a short-term funding package late Saturday that dropped assistance for Ukraine.

“We have time, not much time, and there’s an overwhelming sense of urgency,” he said, noting that the funding bill lasts only until mid-November. Biden urged Congress to negotiate an aid package as soon as possible.

“The vast majority of both parties—Democrats and Republicans, Senate and House—support helping Ukraine and the brutal aggression that is being thrust upon them by Russia,” Biden said. “Stop playing games, get this done.’’

But many lawmakers acknowledge that winning approval for Ukraine assistance in Congress is growing more difficult as the war grinds on. Republican resistance to the aid has been gaining momentum and the next steps are ahead, given the resistance from the hard-right flank.

While Senate Majority Leader Chuck Schumer, D-N.Y., has begun a process to potentially consider legislation providing additional Ukraine aid, House Speaker Kevin McCarthy, R-Calif., faces a more difficult task in keeping the commitment he made over the objections of nearly half of his GOP majority.