Rep. Ken Buck Kenneth (Ken) Robert BuckRepublicans call for Judiciary hearing into unrest in cities run by Democrats Hillicon Valley: Facebook bans ads from pro-Trump PAC | Uber reports big drop in revenue | US offers M reward for election interference info Senate passes legislation to ban TikTok on federal devices MORE (R-Colo.) on Friday challenged former Vice President and Democratic presidential candidate Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE to take his AR-15-style rifle from his congressional office in Washington, D.C.

"I have just one message for Joe Biden and [former Rep.] Beto O’Rourke [D-Texas), if you want to take everyone’s AR-15s, why don’t you swing by my office in Washington, D.C. and start with this one?" Buck tweeted.

"Come and take it," he added. The tweet also had a video of Buck taking the gun off of his office wall and holding it.

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I have just one message for Joe Biden and Beto O’Rourke, if you want to take everyone’s AR-15s, why don’t you swing by my office in Washington, D.C. and start with this one?



Come and take it. #2A pic.twitter.com/jG2SiXetov — Congressman Ken Buck (@RepKenBuck) March 6, 2020

The gibe came after O'Rourke made an appearance on stage with Biden at a campaign rally in Dallas.

“I want to make something clear: I’m going to guarantee you this is not the last you’ve seen of him,” Biden told the crowd Monday, referring to O'Rourke.

“You’re going to take care of the gun problem with me. You’re going to be the one who leads this effort," Biden continued.

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O'Rourke, who was a Democratic presidential candidate early in this election cycle before dropping out, promised in a September primary debate to take away legally obtained assault rifles if he was elected.

"Hell yes, we’re going to take your AR-15, your AK-47,” the former congressman said at the time.

Buck has had the AR-15 in his office since at least 2015, when a picture of him and former Rep. Trey Gowdy Harold (Trey) Watson GowdySunday shows preview: Election integrity dominates as Nov. 3 nears Tim Scott invokes Breonna Taylor, George Floyd in Trump convention speech Sunday shows preview: Republicans gear up for national convention, USPS debate continues in Washington MORE (R-S.C.) posing with the gun raised eyebrows.

The District of Columbia has some of the strictest gun laws in the nation, and AR-15s are banned. However, according to the Capitol Police, "members of Congress may maintain firearms within the confines of their office and they and any employee or agent of any member of Congress may transport within the Capitol Grounds firearms unloaded and securely wrapped."