WASHINGTON — President Biden and Ukraine’s leader, Volodymyr Zelenskyy, will meet at the White House on Tuesday as the U.S. administration steps up the pressure on Congress to provide billions more in aid to Kyiv in its war with Russia.

The visit is intended “to underscore the United States’ unshakeable commitment to supporting the people of Ukraine as they defend themselves against Russia’s brutal invasion,” the White House said in a statement Sunday. “As Russia ramps up its missile and drone strikes against Ukraine, the leaders will discuss Ukraine’s urgent needs and the vital importance of the United States’ continued support at this critical moment.”

Zelenskyy’s office confirmed that he had accepted Biden’s invitation. He also has been asked to speak to a meeting of all senators.

Biden has asked Congress for a $110 billion package of wartime funding for Ukraine ($61.4 billion) and Israel, along with other national security priorities. But the request is caught up in a debate over U.S. immigration policy and border security.

Zelenskyy traveled to Buenos Aires to witness the swearing-in on Sunday of Argentina’s new president, Javier Milei. The Ukrainian leader had been scheduled to address U.S. senators by video last week, but had to cancel the appearance, according to Senate Majority Leader Chuck Schumer of New York.

Congress already has allocated $111 billion to assist Ukraine, and Biden’s budget director, Shalanda Young, said in a letter this past week to House and Senate leaders that the U.S. will run out of funding to send weapons and assistance to Ukraine by the end of the year, which would “kneecap” Ukraine on the battlefield.

Secretary of State Antony Blinken on Sunday defended the emergency sale to Israel of nearly 14,000 rounds of tank ammunition. He  also called for quick congressional approval of the foreign assistance.

Blinken said the needs of Israel’s military operations in Gaza justify the rare decision to bypass Congress. “Israel is in combat right now with Hamas,” he said. “And we want to make sure that Israel has what it needs to defend itself against Hamas.”