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.) released a video slamming 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 just hours before the two are set to meet at Tuesday night’s 2020 primary debate in Iowa.

Sanders appeared to broadcast his points of attack against Biden as the two compete at the top of most national and early state polls, continuing a weeks-long back-and-forth between the two 2020 front-runners that has focused largely on foreign policy.

The video features Sanders speechwriter David Sirota highlighting Sanders’s attacks on Biden for voting for the Iraq War while he was in the Senate, a criticism the campaign has heavily promoted following increased turmoil in Iran and the broader Middle East.

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When you look at my record vs. Joe Biden's record, I just don't think that Biden's record is going to bring forth the energy that we need to defeat Trump. pic.twitter.com/Y8UJYJT6wT — Bernie Sanders (@BernieSanders) January 14, 2020

“Joe Biden voted and helped lead the effort for the war in Iraq, the most dangerous foreign policy blunder in the modern history of this country,” Sanders says in a CNN clip replayed in the video.

Biden “not only helped Republicans pass the Iraq War resolution; he led the fight to help Republicans vote down Democratic amendments to limit that resolution,” Sirota adds.

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The video goes on to slam Biden over his support for the “disastrous” North American Free Trade Agreement, which has been a top target for President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE and progressives alike. The video also bashes the former vice president’s past efforts to cut government spending for Social Security and support for a bankruptcy bill that, Sanders said, “caused enormous financial problems for working families.”

Sanders and Biden are expected to tangle further at Tuesday night’s primary debate in Iowa as polls for the Hawkeye State, which holds the nation’s first nominating contest on Feb. 3, show them locked in a tight battle for the race’s lead 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.

Biden and Sanders increasingly began to feud after this month’s killing of Qassem Soleimani, Iran’s top general. Biden maintained that he was best fit to guide American foreign policy because of his years serving on the Senate Foreign Affairs Committee and as vice president, leading Sanders to pounce on controversial calls such as Biden's Iraq War vote.