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"If Donald Trump were the president, Capt. Khan would have still be alive today because we never would have entered the Iraq War in the first place, we've been very clear about that," Lewandowski said on CNN's "New Day."

Trump has repeatedly railed against the Iraq War, conducted under George W. Bush, during his presidential bid. Last week he tweeted of his Democratic opponent, Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE, "Hillary voted for the Iraq war, not me!"

Still, Trump endorsed invading Iraq during a Sept. 11, 2002, radio interview, telling Howard Stern, "Yeah, I guess so." Soon after the war started in 2003, Trump remarked on the "tremendous cost" of the war and by 2004 his opposition was "well documented," according to FactCheck.org.

For several days, Trump and his political allies have scrambled to respond to fallout over the candidate's public feud with the parents of the slain soldier, who was Muslim.

Khizr Khan denounced Trump's views at last week's Democratic National Convention in Philadelphia.