Donald Trump's former campaign manager argued Monday that Capt. Humayun Khan, the son of Khizr Khan, would still be alive if Trump had been president, due to his opposition to the Iraq War.

"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," Corey Lewandowski said on CNN in an effort to contrast Trump with former Secretary of State Hillary Clinton, who voted for the war and then said later she opposed it.

Lewandowski made that point even as Trump continued to feud with Khan, who spoke out against Trump in his speech before the Democratic National Convention last week.

Earlier Monday, Trump fired off a pair of tweets after Khan continued to give interviews Monday morning.

Despite Trump's repeated claims that he has been against the Iraq War, he endorsed it during an interview with Howard Stern in 2002 before coming out against it soon after the March 2003 invasion.