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Yet and is not expected to return for two weeks while continued has nearly been exhausted. The Biden administration is planning to send one more aid package before the new year, but says it will be the last unless Congress approves more money.

With support slipping in Congress even as conflicts and unrest rattle global security, the to assert its role in the world. Under the influence of , the former president who is now the Republican Party front-runner, GOP lawmakers have increasingly taken a skeptical stance toward U.S. involvement abroad, particularly when it comes to aid to Ukraine.

have implored Western nations to continue their robust support, but and building up resources for a fresh effort as the war heads towards its third year.

Ukraine's lifelines to the West are also imperiled in the European Union, which sent 1.5 billion euros ($1.6 billion) each month to ensure macroeconomic stability, pay wages and pensions, keep hospitals and schools running, provide shelter for displaced people and rebuild infrastructure destroyed in .

That package has now expired and the EU's executive branch failed to produce another one for the new year when Hungary vetoed a 50 billion euro ($55 billion) package this month.

Bolstering Ukraine's defense used to be celebrated in the U.S. Capitol as one of a few remaining bipartisan causes. But now the fate of roughly $61 billion in funding is tied to over border and immigration changes. And in the last year, lawmakers have had to mount painstaking, round-the-clock efforts to pass even legislation that maintains basic functions of the U.S. government. Bills with ambitious changes have been almost completely out of reach for the closely divided Congress.

Still, congressional leaders are trying to rally members to address global challenges they say are among the most difficult in decades: the largest land invasion of a European nation since World War II, a war between Israel and Hamas, unrest and economic calamity driving historic levels of migration and China asserting itself as a superpower.

In the Senate, both Democratic and Republican leaders have cast the , which is attempting to address all those issues, as a potential turning point for democracy around the world. Senate Majority Leader told reporters last week that “history will look back if we don’t support our ally in Ukraine.�

“We’re living in a time when there are all kinds of forces that are tearing at democracy, at here and abroad,� Bennet said.

In a year-end speech, Senate Republican Leader said: “From South Texas to Southeast Asia and from the Black Sea to the Red Sea, it is an historically challenging and consequential time to protect America’s interests, our allies and our own people.�

The Republican leader, a key supporter of Ukraine aid, has tried for months to build support in his party for Ukraine. But after a for Ukraine collapsed in October, McConnell began telling top White House officials that any funding would need to be paired with border policy changes.

The White House deliberately stayed out of the negotiations until senior officials felt the time was right to do so. But senior Republicans involved in the border talks believe the administration stepped in too late, ultimately delaying the prospects of additional Ukraine aid getting approved until the new year.

Senate negotiators have had to navigate both the explosive politics of border policy as well as one of the most complex areas of American law.

“This is a tightrope, but we are still on it,� said Sen. Chris Murphy, the lead Democratic negotiator.

At one point during the negotiations, McConnell felt compelled to stress the urgency to administration officials and impose a deadline to reach a border deal in time for the agreement to be drafted into legislative provisions before the end of the year.

With the negotiations still plodding along, McConnell called White House chief of staff Jeff Zients on Dec. 7 and said a deal must be reached within five days — a message that the Kentucky Republican emphasized to President himself when the two men spoke later that day, according to a person familiar with the discussions.

It wouldn’t be until five days later, on Dec. 12, that Homeland Security Secretary Alejandro Mayorkas and senior White House aides came to the Capitol to participate directly in the negotiations. A White House official said the administration got involved when it did because it felt the talks had moved beyond the realm of unacceptable or unattainable measures — and to a more productive phase.

A second White House official stressed that previous legislative negotiations, such as the bipartisan infrastructure law that is now more than two years old, started similarly, with Republican and Democratic senators talking on their own and the administration stepping in once it felt the talks were ready for White House involvement.

Still, “it would be nice to have had them earlier,� Oklahoma Sen. James Lankford, the chief GOP negotiator, said last week.

“We would have a lot more progress, and we would have had potential to be able to get this done by this week if they would have gotten earlier,� Lankford said. The two White House officials and the person familiar with McConnell's phone call to Biden all spoke on condition of anonymity to discuss the private and ongoing negotiations.

The White House's strategy of including Republican priorities such as Israel aid and border security in the package has also raised several thorny issues for Democrats.

Progressive lawmakers, critical of Israel's campaign into , have called for humanitarian conditions to be placed on the money for Israel. And have also been critical of restrictions on asylum claims.

Any package also faces deep uncertainty in the House, where Republican Speaker holds tenuous control of the closely divided chamber. Before becoming speaker in October, Johnson had repeatedly voted against aid for Ukraine, but he has surprised many by offering support for Ukrainian President Volodymyr Zelenskyy and saying he wants to find a way to approve the aid.

But Trump’s allies in the House have repeatedly tried to stop the U.S. from sending more aid to Ukraine. And Rep. Marjorie Taylor Greene, a close ally to the former president, said it was a mistake for Republicans even to insist on border policy changes because it could “give the Biden administration some kind of policy wins out on the campaign trail.�

As the border and immigration talks drag forward in the Senate, Johnson has weighed in from afar to push for sweeping measures. On social media, he has called for “transformational change to secure the border,� and pointed to a hardline bill that passed the House on a party-line vote.

As senators left Washington, they still sought to assure Ukrainians that American help was on its way. White House staff and Senate negotiations planned to work on drafting border legislation for the next two weeks in hopes that it would be ready for action when Congress returns.

Schumer told The Associated Press he was “hopeful,� but “I wouldn’t go so far as to say confident yet.� He sought to put the pressure on Republicans, saying they needed to be ready to compromise.

Yet Sen. Roger Wicker, a Mississippi Republican who is a Ukraine supporter, expressed confidence that Congress would act. He alluded to the words of former British Prime Minister Winston Churchill, another European leader who eventually elicited robust support from the U.S. to repel an invasion.

“Americans will always do the right thing,� Wicker said. “After they’ve exhausted every other alternative.�

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This story has been corrected to show that Wicker represents Mississippi, not Alabama.

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Associated Press writer Lisa Mascaro contributed to this report.