Former Vice President 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 was heard on a hot mic briefly joking with Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) about his arm gestures at the Democratic presidential debate on Tuesday night.

Biden leaned in and whispered to Sanders when the two shook hands at the start of the debate in Des Moines, moments after the Vermont senator joined the former vice president onstage.

“We’re close,” Biden was heard telling Sanders, apparently referring to the lecterns behind them. “Be careful with your arms.”

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Sanders responded by laughing and patting Biden on the arm.

HOT MIC: Biden To Bernie: We're close -- be careful of your arms"



pic.twitter.com/SDVCWDrKZL — Breaking911 (@Breaking911) January 14, 2020

The Vermont senator is known for his enthusiastic arm gestures at debates. He joined Biden at center stage for the CNN-Des Moines Register debate Tuesday night, the last debate before the Iowa caucuses early next month.

The two are considered front-runners in Iowa, along with Sen. Elizabeth Warren Elizabeth WarrenWarren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon No new taxes for the ultra rich — fix bad tax policy instead MORE (D-Mass.) and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq A socially and environmentally just way to fight climate change MORE.