Trump debate 11
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Trump debate 11
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ST LOUIS, MO - OCTOBER 09: Republican presidential nominee Donald Trump responds to a question during the town hall debate at Washington University on October 9, 2016 in St Louis, Missouri. This is the second of three presidential debates scheduled prior to the November 8th election. (Photo by Scott Olson/Getty Images)
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(CNN) —  

Warning: This story contains explicit language

A foreign policy spokesman for Hillary Clinton’s presidential campaign tweeted to Donald Trump during the second presidential debate Sunday, saying the Republican nominee should “go fuck yourself.”

Jesse Lehrich tweeted, “hey, @realDonaldTrump – regarding your claim that Captain Khan would be alive if you were president: go fuck yourself. #debate”

Lehrich, who has been actively tweeting about the debate, later apologized about his tweet, but didn’t delete it. He wrote, “I want to apologize for the clearly inappropriate nature and language of this personal tweet. Sorry all.”

He was responding to Trump’s claim during the presidential debate that Humayun Khan – whose parents spoke out against Trump at the Democratic National Convention – would still be alive if he had been president.

Trump said during the debate: “First of all, Captain Khan is an American hero. If I were president at that time, he would be alive today, because unlike her who voted for the war without knowing what she was doing, I would not have had our people in Iraq. Iraq was a disaster. So he would have been alive today.”