In what is now just coming to light, Don Lemon had a “nasty” exchange with “CNN This Morning” colleague Kaitlan Collins back in December.

During CNN’s breaking news of Brittney Griner’s release from Russia, there were multiple times when Collins attempted to jump in on the conversation while Lemon was speaking.

According to a Fox News report, Lemon wagged his finger above the desk and told her “standby one second.”

Lemon, 56, got “nasty” with Collins, 30, scolding her for “interrupting” him, which left the female co-host “visibly upset,” a source who witnessed the exchange told Fox News Digital.

Lemon did not appear on the Dec. 9 broadcast with co-host Poppy Harlow telling viewers, “Don has the day off.”

The New York Post first reported on the incident, which a CNN spokesperson told Fox News Digital is “wildly overblown.”

CNN issued a statement to Mediaite regarding the report: “The Post’s account is wildly overblown and two months old. Don, Kaitlan and Poppy were friends before they were co-anchors and they remain friends today.”

Despite CNN formally pushing back, Mediaite can confirm that the events described by the Post are largely true — though Lemon’s alleged “screaming” is being overplayed.

The Post’s report suggests things haven’t been smoothed over yet.

Mark Heim is a reporter for The Alabama Media Group. Follow him on Twitter @Mark_Heim.