Biden made the remark in response to a question from Polish Radio's White House correspondent Marek Wałkuski on Thursday.
Asked if US Congress would approve his USD 61 billion package of military aid for Ukraine following negotiations on Wednesday, the US president replied that the "vast majority" of lawmakers were in favour of further support for Kyiv.
Biden added that the question remained if a "small minority" of Congress members would manage to "block" Ukraine aid.
The US president said that it would be a "disaster," polskieradio24.pl website reported.
The US Senate was expected to hold a vote on the USD 61 billion Ukraine aid package in early 2024, according to news outlets.
The package would then have to be approved by the House of Representatives, controlled by the Republicans, who have demanded that Biden pair the Ukraine aid with tougher border policies, The Kyiv Independent website reported.
Thursday is day 694 of Russia’s war on Ukraine.
Russia invaded Ukraine on February 24, 2022, launching the largest military campaign in Europe since World War II.
Source: IAR, polskieradio24.pl, The Kyiv Independent