Congress, currently controlled by Biden's Democrats, is expected to approve $44.9 billion more this week in a bill funding the federal government.
Zelenskiy stressed as he began his speech that he was addressing both Democrats and Republicans.
"No more blank checks to Ukraine," Republican Representative Andy Biggs wrote on Twitter hours before Zelenskiy's visit to Washington.
Biggs, a member of the conservative House Freedom Caucus, has emerged as the main challenger to House Republican leader Kevin McCarthy in the House speakership election, slated for Jan. 3.
Gaetz said nothing had changed his opposition to Ukraine aid and, when asked if there was anything compelling in the speech, said, "I loved the fashion choices."