Video of exchange here:

"Matthews and Priebus were both guests on "Morning Joe," one of the dwindling number of cable talk shows consistently welcoming to people with differing views. The confrontation began when Matthews suggested the Republican leader should be embarrassed at how his party was playing the "race card" during the campaign with advertisements about welfare. The MSNBC host also berated Priebus about Romney's comment during a campaign stop in Michigan that "no one has ever asked to see my birth certificate."

Annoyed after some back-and-forth, Priebus declared: "I'm not going to get into a shouting match with Chris. You guys can move on."

"Because you're losing, that's why," Matthews retorted.

"Garbage," Priebus said.

"You're garbage," Matthews concluded."