GOP lawmaker shows off AR-15 in office, challenges Biden to 'come and take it'

Rep. Ken BuckKenneth (Ken) Robert BuckGOP lawmakers demand answers on withheld restitution following Nassar revelation Hillicon Valley: Biden: Social media platforms 'killing people' | Tech executives increased political donations amid lobbying push | Top House antitrust Republican forms 'Freedom from Big Tech Caucus' Top House antitrust Republican forms 'Freedom from Big Tech Caucus' MORE (R-Colo.) on Friday challenged former Vice President and Democratic presidential candidate Joe BidenJoe BidenFirst lady leaves Walter Reed after foot procedure Biden backs effort to include immigration in budget package MyPillow CEO to pull ads from Fox News 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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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 GowdyTrey GowdyTrey Gowdy sets goal of avoiding ideological echo chamber with Fox News show Fox News signs Trey Gowdy, Dan Bongino for new shows Pompeo rebukes Biden's new foreign policy 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."