Clockwise, from top left, GOP Rep. Tom Emmer of Minnesota, GOP Rep. Jim Banks of Indiana, Donald Trump Jr. and Tucker Carlson.
CNN  — 

The competitive race for House GOP whip has turned nasty in the home stretch, with key allies of former President Donald Trump taking public swipes and placing angry private phone calls to one of the leading contenders for the No. 3 leadership position.

Last week, Fox News host Tucker Carlson got into a heated phone call with GOP Rep. Tom Emmer of Minnesota, who is running for the whip position if Republicans recapture the majority, according to a source familiar with the conversation.

The source said Carlson accused Emmer of planting an anonymous negative quote about Carlson’s 25-year-old son Buckley in a Daily Beast story about Republican Rep. Jim Banks if Indiana, one of Emmer’s top rivals in the whip’s race.