House Speaker Nancy Pelosi and a group of senior Democratic lawmakers returned on Monday from an unannounced meeting with Ukrainian President Volodymyr Zelensky in Kyiv and discussions with Polish President Andrzej Duda.

The trip came as President Joe Biden's administration is under fire by Republicans and some Democrats for taking a more aggressive stand against Vladimir Putin's invasion of Ukraine, including stepped-up weapons transfers.

Democrats joining Pelosi on the weekend trip included House Rules Committee Chairman Jim McGovern, House Foreign Affairs Committee Chairman Gregory Meeks, House Intelligence Committee Chairman Adam Schiff, and Reps. Barbara Lee, Bill Keating, and Jason Crow. The group discussed “bolstering the NATO alliance to counter Putin's aggression” with leaders, with the members in attendance not told until departure that they would be going to Ukraine, a Pelosi aide confirmed. The aide added that Republican members were invited to join the delegation but ultimately refrained from going.

“Multiple House Republicans were invited on this trip. Obviously, given security precautions, all potential delegation members were told this was a CODEL to Poland. None of the Republicans accepted the invitation. We will not be disclosing names because that would hinder our ability to form bipartisan delegations in the future,” a Pelosi aide confirmed.

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The trip comes on the heels of Secretary of State Antony Blinken and Defense Secretary Lloyd Austin meeting with officials in Ukraine last week.

Since the war began, multiple bipartisan delegations have gone abroad to meet with allied nations on how to best address the invasion. And in March, Zelensky gave a rare address to Congress in a push for additional assistance in an emotional speech.

The trip took place just days after the Biden administration called for Congress to provide an additional $33 billion in military, economic, and humanitarian aid in an effort to help the country defend itself as the war rages on.

While Democrats expressed support for Ukraine abroad, some senior GOP lawmakers say the country would be better served by members being in Washington to act swiftly on providing more resources.

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While the Biden administration and defense hawks are pushing for swift action on providing more funding, one senior source told the Washington Examiner that a bill coming to the floor may not be immediate.

“Language must also be drafted," the source said. "This will not be an instant process."