“I’m trying to recall a single instance of a resignation of conscience at Fox News over the network’s support for Putin’s war” Frum tweeted. “Marina Ovsyannikova risked life and liberty to tell her viewers the truth. Is there one wealthy Fox director or employee willing to forgo a single check?”

The tweet apparently irked Rivera, a cohost on The Five.

“Fuck you,” Rivera responded. “You don’t know me. Do you even have a job?”

Frum’s claim that the network supports Putin’s invasion is unfounded. Numerous Fox News hosts, including Rivera, Jesse Watters, and Sean Hannity have vocally supported sending military aid to Ukraine. Others, such as Tucker Carlson and Laura Ingraham, meanwhile, have suggested the matter is a European affair the U.S. should be cautious about getting involved in, if at all. Neither has condoned Russia’s invasion of the country.