Top US Senate leaders will host an all-members meeting with Ukrainian President Volodymyr Zelenskiy on Thursday, according to a Senate leadership aide, as House Republicans are preparing to block a Biden administration request for $24 billion in emergency Ukraine war funds.

Zelenskiy is expected to meet President Joe Biden at the White House the same day, traveling to Washington after attending the United Nations General Assembly. He’s expected to seek renewed commitments by US leaders to help Ukraine’s fight to regain occupied land from Russia.

Chuck Schumer, the Democratic majority leader in the Senate, and Minority Leader Mitch McConnell are due to host the meeting on Capitol Hill.

Congress faces a Sept. 30 deadline for the end of the fiscal year, with no solution in sight to avoid a potential government shutdown. Conservative hard-liners in the House have threatened to shut down the government if the budget deal includes more aid to Ukraine.

Ahead of Zelenskiy’s visit, four top Senate Republicans pushed Biden to provide Ukraine with long-range missiles. The letter rejects the argument by some conservatives that the aid dips too far into the US weapon supply, saying only a small part of US stockpiles would be needed.

The trip will be Zelenskiy’s first visit to Washington in more than six months.