A war of words between two Fox News personalities escalated when Tucker Carlson hit back at Shepard Smith after the daytime host characterized Carlson’s handling of one of his guests as “repugnant.”

The feud began Tuesday when Carlson brought former U.S. Attorney Joe diGenova on his opinion show after Democrats announced they had begun an impeachment inquiry into President Trump. DiGenova ripped Fox News contributor Judge Andrew Napolitano, calling him “a fool” for saying during an interview with Smith that Trump had already admitted to committing a crime.