Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) said on Wednesday that it was a mistake for anyone to have voted for the Iraq War nearly two decades ago when pressed on Democratic front-runner Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE's decision to support the war when he was in the Senate.

"Look, I think the war was a mistake and I think it was a mistake for anyone to vote for that war," Warren said during an appearance on MSNBC's "Morning Joe."

When asked again if Biden made a mistake in voting for the war, Warren replied, "Everybody."

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Warren's comments come hours after Iran claimed responsibility for the launch of missiles at a pair of military bases in Iraq housing U.S. troops and coalition personnel on Tuesday evening.

The developments marked a major escalation in tensions between Washington and Tehran after the U.S. killing of a top Iranian general.

Progressive Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) has hammered Biden in particular over his 2002 vote in favor of the war.

“I just don’t think that that kind of record is going to bring forth the kind energy we need to defeat Trump,” Sanders told CNN on Monday night.

Biden has touted his own foreign policy experience in the Obama administration and on the Senate Foreign Relations Committee amid escalating tensions with Iran.

“I served in the executive branch of our government for eight years, but I served in the legislative branch for 36 prior to that — and I understand better than anyone that the system will not hold unless we find ways to work together to advance our national interests — not the political interests of one person or one party,” Biden said at an address in New York on Tuesday.

Biden, Sanders and Warren are all battling for position in the Iowa caucuses, which take place in less than a month.