Democratic presidential candidate Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE on Sunday hit front-runner and former Vice President Joe Biden Joe BidenBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Joe Biden should enact critical government reforms if he wins MORE for his role in backing the Iraq War, which the South Bend, Ind., mayor deemed the nation’s “worst foreign policy decision” of his lifetime.

“This is an example of why years in Washington is not always the same thing as judgment,” Buttigieg said in response to a question about how his foreign policy experience measured up to his 14 Democratic primary opponents during an appearance on “Iowa Press,” according to The Associated Press.

“He supported the worst foreign policy decision made by the United States in my lifetime, which was the decision to invade Iraq.”

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Buttigieg issued a similar line of attack against Biden while speaking to reporters outside a campaign event in Knoxville, Iowa, according to the AP.

“It’s certainly a question that reflects on foreign policy judgment at a time like this when it’s so precarious for the people of the U.S.,” Buttigieg reportedly said. “Obviously, my judgment is different when it comes to a lot of these issues.”

A Biden spokesperson was not immediately available for comment.

Biden was a member of the Senate Foreign Relations Committee when the U.S. went to war. He is the only top-tier candidate in the race who voted for the war. Sen. Bernie Sanders Bernie SandersTrump, Biden will not shake hands at first debate due to COVID-19 Sanders tells Maher 'there will be a number of plans' to remove Trump if he loses Sirota reacts to report of harassment, doxing by Harris supporters MORE (I-Vt.) was a sitting House member at the time of the decision and vocally opposed the war.

Buttigieg, 37, has been criticized by some of his opponents that have questioned if the young mayor’s experience is enough to lead the country and take on President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE next year. Buttigieg argues that what he lacks in years of Washington experience, he largely makes up for in years of service in the military.

Before entering politics, Buttigieg served as a Navy intelligence officer in Afghanistan.

The mayor has risen to the top of polls in Iowa, surging ahead of Biden, Sanders and Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.). The first-in-the-nation Iowa caucuses take place Feb. 3.