WASHINGTON (AP) 鈥 Ukrainian President Volodymyr Zelenskyy is preparing to visit Washington on Wednesday, according to three AP sources, in his first known trip outside the country since Russia's invasion began in February.

Two congressional sources and one person familiar with the matter confirmed plans for the visit. They spoke on the condition of anonymity because of the highly sensitive nature of the trip. They said Zelenskyy's visit, while expected, could still be called off at the last minute due to security concerns.

The visit to Washington is set to include an address to Congress on Capitol Hill and a meeting with President Joe Biden. It comes as lawmakers are preparing to vote on a year-end spending package that includes about $45 billion in emergency assistance to Ukraine and as the U.S. prepares to send Patriot surface-to-air missiles to help stave off Russia's invasion.

The latest tranche of U.S. funding would be the biggest American infusion of assistance yet to Ukraine, above even Biden鈥檚 $37 billion emergency request, and would ensure that funding flows to the war effort for months to come.

House Speaker Nancy Pelosi encouraged lawmakers to be on hand for Wednesday evening鈥檚 session.

鈥淲e are ending a very special session of the 117th Congress with legislation that makes progress for the American people as well as support for our Democracy,鈥 Pelosi wrote Tuesday in a letter to colleagues. 鈥淧lease be present for a very special focus on Democracy Wednesday night.鈥

Zelenskyy has 鈥 almost daily 鈥 addressed various parliaments and international organizations by video and he has sent his wife to foreign capitals to drum up assistance.

On Tuesday, he made a daring and dangerous trip to what he called the hottest spot on the 1,300-kilometer (800-mile) front line, the city of Bakhmut in Ukraine鈥檚 contested Donetsk province. In a video released by his office from the Bakhmut visit, Zelenskyy was handed a Ukrainian flag and alluded to delivering it to U.S. leaders.

鈥淭he guys handed over our beautiful Ukrainian flag with their signatures for us to pass on,鈥 Zelenskyy said in the video. 鈥淲e are not in an easy situation. The enemy is increasing its army. Our people are braver and need more powerful weapons. We will pass it on from the boys to the Congress, to the president of the United States. We are grateful for their support, but it is not enough. It is a hint 鈥 it is not enough.鈥

The U.S. has committed almost $20 billion in security assistance to Ukraine since Russia launched its invasion on Feb. 24, according to figures from the Pentagon. The U.S. is also providing intelligence to Ukrainian forces and helping Ukraine fend off Russian cyberattacks and efforts at sabotage, American and Ukrainian officials have said.

The visit comes at an important moment as the White House braces for greater resistance from a Republican-controlled House that鈥檚 signaled it will put more scrutiny on aid for Ukraine in the new Congress. GOP leader Kevin McCarthy has said his party鈥檚 lawmakers will not write a 鈥渂lank check鈥 for Ukraine.

Biden and Zelenskyy frequently have held phone calls in coordination with the White House announcing new tranches of military assistance for Ukraine. The calls have been mostly warm, with Biden praising Ukraine for remaining steadfast against the Russians and Zelenskyy thanking the U.S. president for support.

The one exception was a June phone call soon after Biden notified Zelenskyy an additional $1 billion package was headed to Ukraine. Zelenskyy didn鈥檛 miss a beat in listing additional assistance he said Ukraine needed. That irked Biden, who underscored to Zelenskyy the American people鈥檚 generosity.

The brief moment of tension hasn鈥檛 caused any lasting difficulty, according to officials familiar with the episode.

Earlier this month, several Ukrainian officials 鈥 including Foreign Relations Committee Deputy Chairwoman Maria Mezentseva and parliament members Olena Khomenko and Lesia Zaburanna 鈥 traveled to Washington to meet with U.S. lawmakers to thank them for American assistance and emphasize the need to keep the money flowing.

Zelenskyy addressed Congress by video link in March. Wearing an army green T-shirt with the Ukrainian flag behind him, he argued that the U.S. and Ukraine shared common dreams and goals.

鈥淒emocracy, independence, freedom and care for everyone, for every person, for everyone who works diligently, who lives honestly, who respects the law,鈥 he said then. 鈥淲e in Ukraine want the same for our people. All that is normal part of your own life.鈥

His visit comes in the final days of Pelosi鈥檚 House speakership. Republicans will take control of the House in January, while Democrats retain power in the Senate. While Republicans set to chair key national-security committees push for continued support of Ukraine, there are growing concerns among the GOP rank-and-file about the cost and duration of the effort.

Pelosi, who visited Zelenskyy earlier this year in Kyiv, said it was 鈥渙verwhelming鈥 to see the Ukrainians鈥 commitment to democracy.

鈥淭hey are fighting for democracy for all of us.鈥

News of Zelenskyy's visit was first reported by Punchbowl News.

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