Joe Biden this week used dubious claims about his own foreign policy past in the Balkans to bash President Trump’s decision to take out Iranian military commander Qassem Soleimani in an airstrike.

In an interview with NBC’s Lester Holt on Tuesday, the Democratic presidential front-runner claimed Trump’s warnings of an “imminent attack” could not be trusted because the president had “lied so much.”

And when asked by Holt why his own judgment should be valued — especially given his vote in favor of the Iraq War — the former vice president, 77, took credit for pushing Congress to act on ethnic cleansing in Bosnia in the 1990s.

“Look, I’m the guy that started the effort to make sure we took down the guy who was engaged in genocide in the Balkans: Slobodan Milosevic,” Biden told Holt, referring to the former leader of Serbia and Yugoslavia.

But a Washington Post report from 2008 found Biden was in fact the ninth co-sponsor of the bill.

“Despite the bravado, Biden was not a key player in the legislation that ultimately forced Bill Clinton to lift an arms embargo imposed by the United Nations on Bosnian Muslims fighting the Serbs,” the article read.

A Republican aide who did draft the legislation said while Biden’s views were “consistent” with the bill, “I never regarded him as a leader in the effort.”

The article — written after Barack Obama selected Biden to be his running mate — found the former Delaware senator was “hardly shy” about emphasizing his role in world affairs, but “the hard legislative work was left to others.”

In a CNN vice presidential debate with then-Alaska Gov. Sarah Palin in 2008, Biden again boosted the claim.

“My recommendations on Bosnia. I admit I was the first one to recommend it. They saved tens of thousands of lives,” he said on stage.

In his 2007 memoir, “Promises to Keep,” Biden recounted the story of how, as a US senator, he dramatically confronted Milosevic at a 1993 meeting, allegedly telling him: “I think you’re a damn war criminal and you should be tried as one.”

He also regaled readers with tales of his “pretty lonely crusade” to convince President Clinton to lift an arms embargo on Bosnian Muslims trying to defend themselves.

Several people in the room during Biden’s now-infamous meeting with Milosevic also declined to corroborate his story about confronting the strongman.

Biden’s then-chief of staff Ted Kaufman told The Post the incident occurred exactly as Biden recounted it, but John Ritch, then an aide on the Senate Foreign Relations Committee, said he couldn’t remember such a statement.

A third Biden aide in the room also couldn’t recall the confrontation, as per the report, while a fourth declined to comment.

The Biden campaign did not return messages seeking comment.