WASHINGTON — Ukrainian President Volodymyr Zelenskyy came to Washington on Thursday with a problem to solve.

A year and a half after Russia invaded Ukraine, once bipartisan support for U.S. military funding for his embattled nation has evaporated.

Seventy-one percent of Republicans — along with 55% of independents but just 38% of Democrats — said in a CNN poll in July that Congress should not authorize additional funding for the war.

Some GOP members have followed their constituents’ lead. In August, 70 House Republicans, nearly a third of their caucus, voted for an amendment that would have cut off all U.S. aid to Ukraine. Rep. Doug LaMalfa of California was the sole Republican from the Golden State to vote for the measure, which failed after Democrats voted with the majority of the House GOP to kill it.

Zelenskyy, fresh from a visit to the United Nations General Assembly in New York City, arrived at the Capitol on Thursday under heavy security. His top priority: to make sure the number of Republicans unwilling to continue funding the war effort doesn’t get any bigger.

A meeting with House Speaker Kevin McCarthy, R-Calif., who’s also facing a looming government shutdown and a potential leadership coup by far-right members of his caucus, was first on the Ukrainian leader’s agenda. The meeting was attended by committee and party leaders, including House Minority Leader Hakeem Jeffries, D-N.Y. Zelenskyy later met with senators behind closed doors.

McCarthy declined Zelenskyy’s request to address a joint session of Congress, saying there was not enough time. He also reportedly declined a White House offer to give House lawmakers the same classified briefing the Senate received this week.

Asked by reporters about the meeting with Zelenskyy, McCarthy said only that “it was good.”

When the meeting ended, McCarthy bolted to wrangle far-right members to back legislation to advance Pentagon funding. The measure failed in a floor vote, adding to the list of McCarthy’s problems as the federal government barrels toward a shutdown by the end of this month.

Senate Minority Leader Mitch McConnell, R-Ky., was more enthusiastic after his meeting with the Ukrainian president.

“American support for Ukraine is not charity,” he said after they met. “It’s an investment in our own direct interest — not least because degrading Russia’s military power helps to deter our primary strategic adversary: China.”

Zelenskyy emphasized Ukraine’s gratitude for U.S. assistance — and expressed thanks to “both parties” in a tweet Thursday afternoon. “We have accomplished much together to safeguard democracy, freedom, and dignity — values shared by both of our nations,” he added.

Many of California’s Republican House members are in a particularly difficult position. Of the 18 Republicans from districts nationwide that President Joe Biden won in 2020, five — nearly a third — are in California. If they continue to back the war effort, they could alienate the GOP base in their districts. But voting against Ukraine aid, which Democrats still support, could limit their crossover appeal.

Peter Harris, a political scientist at Colorado State University, told the Los Angeles Times that some Republicans oppose approving funding because they believe the United States should be more focused on defeating another world power: China. Harris also predicted that support for Ukraine will probably continue to wane as the war drags on.

“I wouldn’t be surprised if a pretty sizable faction within the Republican Party came to the determination that it would be politically prudent to end the war rather than supporting Ukraine,” he said.

Some Republicans vying for the White House have already made that call. During the GOP primary debate in August, Florida Gov. Ron DeSantis and tech entrepreneur Vivek Ramaswamy both said they would stop aid to Ukraine if elected president.

“It’s not unusual for the opposition party to be skeptical of an administration’s policies,” Alex Conant, a Republican strategist, told the Times.

Democrats were the first to critique then-President George W. Bush over the war in Iraq, and now some Republicans are doing the same of Biden over his strategy for Ukraine, Conant noted.

“They’re the opposition, so they’re not invested in his policies,” he said.

Conant added that there is a small but growing number of Republicans who are “very skeptical of foreign interventions” and that a “small faction can cause big problems.” Still, a majority of the GOP backs sending military aid, especially in the Senate.

Though support for the war has also slipped among Democratic voters since the invasion, the party’s lawmakers remain overwhelmingly supportive of approving military aid.

In an interview with the Times, Rep. Jimmy Gomez, D-Calif., said that “when there is contention within any political party, people try to distinguish themselves from one another.”

He noted that many Republicans on the House Intelligence Committee understand the stakes: If American military aid stops, it will make the war even more challenging for Ukrainians.

Propaganda pushed out by the Kremlin is convincing many voters that the United States should not be involved in Ukraine — and some Republicans are gleefully repeating that propaganda, Gomez said.

Congress must “send a loud message ... across the globe that we stand by our friends and we’re not going to let them get taken over by a rogue country,” he said.

“The role of the United States and its stature around the globe relies on us following through on our word,” Gomez added. “And if we allow a country like Russia to invade another country, it might create a willingness of other countries to take action through military might.”

Zelenskyy left the Capitol before noon, traveling to the Pentagon to meet with Defense Secretary Lloyd J. Austin III. The Ukrainian leader also met with Biden at the White House on Thursday afternoon.

Seated next to Biden in the Oval Office, Zelenskyy thanked the president for providing continued support to combat “Russian terror.”

“It’s good that our countries are really truly allies,” Zelenskyy said. “Today I’m in Washington to strengthen our ability to defend Ukrainian children, our families, our homes, freedom and democracy in the world.” He added that he looked forward to their discussion on military support from the U.S., with a “special emphasis on air defense.”

In a news conference, White House national security adviser Jake Sullivan said that Biden would announce a “new package of military assistance” that would “include significant air defense capabilities to help Ukraine protect its people,” as well as other weapons and equipment to enable the beleaguered nation to “maintain its momentum in the counteroffensive.”

“These capabilities will help Ukraine harden its defenses ahead of what is likely to be a tough winter filled with renewed Russian attacks on Ukrainian critical infrastructure,” Sullivan said.

The Pentagon has opted not to send Army Tactical Missile System long-range missiles, known as ATACMS, to Ukraine, but Biden “has not taken it off the table” in the future, Sullivan added.

Hours before Zelenskyy met with McCarthy, Ukraine was hit with the biggest barrage of Russian missiles in more than a month.

Overnight, 43 Russian cruise missiles struck cities from east to west, including the capital, Kyiv; the country’s second-largest city, Kharkiv, close to the Russian border; and Lviv, near the Polish frontier. Ukraine’s military said it had shot down 36 of the projectiles, including 20 over Kyiv.

Over a period of hours lasting until early morning, the repeated blare of air alarms sent people scrambling for shelter, many with small children and pets in tow. In Kyiv, falling debris damaged several buildings and left at least four people injured.

Zelenskyy made grim note of the wave of strikes, writing in a post on the messaging app Telegram that air defense is “among the top issues” as he seeks to win support in the U.S. Congress for more aid.

Russia’s defeat is an absolute necessity, Linda Thomas-Greenfield, U.S. ambassador to the U.N., told CNN this week.

“Ukraine has to win, because if Ukraine loses this war, we all lose,” she said. “They are fighting on behalf of democracies around the world.”

The United States, she added, “will stand with Ukraine as long as they need us.”

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(Los Angeles Times staff writers Tracy Wilkinson and Courtney Subramanian in Washington and Laura King in Kyiv contributed to this report.)