Sen. Mike Rounds, R-S.D., blasted McCarthy for his decision not to hold a joint session for Zelenskyy, telling NBC News, “There was a possibility that we could have had a joint session, but apparently the House decided that they didn’t have time to do it, which is disappointing.”

“Guess they have their hands full,” Rounds quipped.

This afternoon, President Biden will announce that the U.S. will provide an additional aid package to Ukraine, said Amanda Sloat, the National Security Council's senior director for Europe.

"The president today, as part of President Zelenskyy’s visit, will be announcing an additional package of security assistance," Sloat said in an interview on MSNBC's “Andrea Mitchell Reports.” It’s the fourth package that we will have announced in six weeks, and there is expected to be a very significant amount of air defense included in that package, which is the most critical capability that the Ukrainians need now."

Sloat said the new package will not include ATACMS, which are long-range ballistic missiles that are equipped with cluster munitions — tiny bomblets that disperse widely on a target.

Asked why it won't include the ATACMS, Sloat said, "I’m not going to get ahead of deliberations that are continuing in the administration. President Biden himself has said that ATACMS are not off the table. But that is not something that we are going to be announcing today."

Sloat declined to say whether the new package will include cluster munitions.

She said that, in addition to the Ukrainian president, Zelenskyy's military cabinet will participate in the White House meeting with Biden, as will Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs of Staff Mark Milley.

After participating in the senators' meeting with Zelenskyy, Sen. John Fetterman, D-Pa., blasted members of Congress who are against approving more U.S. funding to Ukraine.

"It’s un-American,” said Fetterman, who was sporting shorts, sneakers and a T-shirt. "I don’t care if I’m in shorts, I stand 1000% firmly in support of Ukraine."

Fetterman is often wearing shorts and sweatshirts around the Capitol. In an apparent nod to Fetterman's preferred attire, Schumer recently relaxed the dress code to allow senators to wear whatever they want on the floor instead of formal attire. Republicans have criticized the decision and Fetterman's outfits.

Zelenskyy met with about 70 senators for a little over an hour in the Old Senate Chamber. 

He spoke entirely in English, without the use of translators, according to two senators in the room, and he took half a dozen questions on everything from a plan for victory to what Ukrainians need most from the U.S. in terms of financial and military aid.

“He was exceptionally good today,” said Sen. Cynthia Lummis, R-Wyo., who has questioned and voted against aid for Ukraine in the past. 

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After his meeting with senators, Zelenskyy was asked by reporters if he had a message for Russian President Vladimir Putin. He replied only: "I'm not speaking with him."

The Ukrainian president also avoided speaking to Russian officials at a United Nations Security Council meeting yesterday in New York City, where he decried Russia as a "terrorist state" that is a threat to the international order. He called for the U.N. to strip Russia of its veto power, which is virtually impossible given the structure of the U.N. charter.

Putin did not attend the annual summit after wrapping up a meeting with another authoritarian leader — North Korea's Kim Jong Un — in an effort that is likely aimed at buoying Russia's waning military supplies.

Zelenskyy stood for photos behind closed doors with leaders in the House.

Several were taken with him standing between Speaker Kevin McCarthy, R-Calif., and Minority Leader Hakeem Jeffries, D-N.Y.

Another photo was taken showing Zelenskyy sitting at a long table with breakfast food in front of him.

Schumer spoke to reporters after Zelenskyy met with senators and said, "There was a single sentence that summed it all up, and I’m quoting him verbatim, Mr. Zelenskyy said: 'If we don’t get the aid, we will lose the war.'"

Biden is scheduled to host Zelenskyy at the White House this afternoon, when they are expected to discuss additional U.S. aid and funding that could be given to Ukraine.

Zelenskyy exited the meeting with senators a little more than an hour after entering the Old Senate Chamber.

The Ukrainian president was seen shaking hands and meeting with senators from both parties once the meeting ended. After he emerged from the room, he walked back through the corridor, flanked by Schumer and McConnell.

When asked what he told lawmakers who don't want to fund Ukraine, Zelenskyy said, "We were happy that senators, the Congress, White House, really the United States, of course ... all people of America really, support us."

Asked about the meeting, Zelenskyy told reporters that they had a "great dialogue."

"We had a great dialogue and we’re thankful to you, to journalists, to senators, to Congress for helping us, support us. We spoke about so many details, but it will be between us, sorry. Thank you," Zelenskyy said.