The political future of GOP Rep. Liz Cheney, seen here on April 28 ahead of President Biden’s joint address to Congress, is increasingly in doubt as she refuses to back down from criticisms of former President Trump.

Representative Liz Cheney (R-WY) waits for the arrival of President Joe Biden, before he addresses a joint session of Congress at the US Capitol in Washington, DC, on April 28, 2021. (Photo by Melina Mara / POOL / AFP) (Photo by MELINA MARA/POOL/AFP via Getty Images)