McConnell and a Senate delegation met with Zelenskyy in Kyiv on Saturday.
Zelenskyy said in a Telegram post that the meeting was a powerful signal of the two-party support of Ukraine by the United States and Congress.
According to a video posted on social media, Senators John Barrasso, John Cornyn, and Susan Collins were in the delegation. It is not clear if the group is still in Ukraine.
The Senate hopes to pass a $40 billion aid package that has already made its way through the House, according to Andrii Yermak, head of the president's office.
In the past few weeks, the U.S. has sent a few government officials to the country. Nancy Pelosi led a congressional delegation to meet with Zelenskyy. Secretary of State Antony Blinken, Defense Secretary Lloyd Austin, Sen. Steve Daines, and Rep. Victoria Spartz traveled to Ukraine.