CNN host Chris Cuomo confronted Ted Cruz about the time Donald Trump called him a "liar" and his wife "ugly".
In a heated Cuomo Prime Time segment, Cuomo chided Cruz for failing to criticise the president after his debate, implying that he was scared to do so.
It all troubles me Ted, to watch guys like you stand by and stroke your beard like a wise man, instead of telling the president to get on it when you have power.
Cruz shot back "how about tell your brother to get on it?", referring to New York's Democrat governor, Andrew Cuomo.
My brother will stand for his own record. Why don't you talk to the president like you talk to my brother? You afraid of him? You think he'll smack you down at home?
My brother's not the president. I'm talking about the president. The one who called you a liar, the one who said your wife was ugly. That guy. The one you won't say anything about.
In 2016, when both men were running for the Republican nomination, Trump called Cruz the "single biggest liar" among the candidates.
He also shared a misogynistic image comparing his wife's appearance to Cruz's.
Cruz did not answer Cuomo's charge, but rather attacked his interviewing style in response.
You actually wonder why you don't have a lot of Republicans that want to come on your show. You scream at me and yell at me and insult me.
While Cruz has generally supported Trump as Texas senator, the two have a rocky history.
Trump would frequently refer to Cruz as "lyin' Ted" during the 2016 primaries. He also called him a "maniac" and a "hypocrite" and suggested that he wasn't qualified to run for president because he was born in Canada.
Cruz, in turn, referred to Trump as "weak" and the "Twitterer-in-chief" and accused him of having ties to the Mafia.
That very personal feud is apparently now just water under the bridge.