The nation's fight over masks hit the floor of the U.S. Senate on Monday when Ohio Sen. Sherrod Brown implored a Republican senator to wear a mask – triggering the Republican's ire.

"I'd start by asking the presiding officer to please wear a mask as he speaks," a masked Brown said before getting cut off.

Alaska Sen. Dan Sullivan responded: "I don’t wear a mask when I’m speaking like most senators. I don't need your instruction."

Brown, a Cleveland Democrat, warned that Sullivan could be exposing Senate staff to COVID-19 by not wearing a mask. What appears to be Sullivan's mask is on the desk in front of him.

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