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Biden to CBS reporter: 'Why, why, why, why, why?'

Joe BidenJoe BidenFormer Rep. Rohrabacher says he took part in Jan. 6 march to Capitol but did not storm building Saudis picked up drugs in Cairo used to kill Khashoggi: report Biden looking to build momentum for Putin meeting MORE told a CBS reporter to "calm down" after he asked the former vice president why he had attacked Sen. Bernie SandersBernie SandersSanders won't vote for bipartisan infrastructure deal Bipartisan infrastructure deal takes fire from left and right Politics of discontent: Who will move to the center and win back Americans' trust? MORE (I-Vt.), a top rival of Biden's for the Democratic presidential nomination. 

"Yesterday, you said you accepted Bernie's apology, now you're attacking him," said Ed O'Keefe, the veteran reporter covering the 2020 presidential campaign for the network. "Why are you doing that? Why wasn't his apology enough, Mr. Vice President? Why attack Sanders?"

After the last question, Biden, who had been ready to leave the press area, turned back to O'Keefe with a wide-eyed expression and walked back toward him. 

"Why, why, why, why, why, why, why?" Biden said, waving his hands toward O'Keefe and bending toward him slightly. 

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"You're getting nervous, man. Calm down, it's OK!" Biden said, putting his hands gently on O'Keefe's shoulder. 

"He apologized for saying I was corrupt, he didn't say anything about whether or not I was telling the truth about Social Security," Biden then states, as O'Keefe recorded the conversation. 

Biden proceeded to give the reporter a soft tap with his fist before leaving the area.

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Biden and Sanders have been battling over Social Security and an op-ed by a supporter of Sanders who called Biden corrupt. Sanders apologized for the op-ed, but his campaign has pressed forward with its argument that Biden had supported efforts to cut Social Security. Biden says he had only supported efforts to fix Social Security. 

Earlier Wednesday on MSNBC's "Morning Joe," Biden accused Sanders and his campaign of taking statements he'd made about Social Security decades ago out of context. 

"I find it amazing that we go back and look at statements and many of them, most of them [are] taken out of context of 10, 30, 35 years ago," Biden told co-hosts Joe ScarboroughCharles (Joe) Joseph ScarboroughScarborough, Greenwald trade insults on Twitter over rise of Trump Biden's poor TV ratings against Trump is exactly what this administration wants Mayor de Blasio announces New York City to 'fully reopen' on July 1 MORE and Mika BrzezinskiMika Emilie BrzezinskiHarris shares advice for women she mentors The Hill's Morning Report - Presented by Citizens' Climate Lobby - Clock winding down on bipartisan infrastructure deal Mayor de Blasio announces New York City to 'fully reopen' on July 1 MORE

"It's like me going back and pointing out how Bernie voted against the Brady Bill five times while I was trying to get it passed when he was in the House, or how he voted to protect gun manufacturers," he continued. "He's made up for that, he's indicated that was [the] past." 

Biden and Sanders are running neck and neck in Iowa with the Hawkeye State's caucuses less two weeks away.