Democratic nominee Joe Biden moved urgently to seize on President Donald Trump’s reported comments that dead service members are “losers,” deeming the “disgusting” utterance by his chief political opponent as disqualifying.

The morning after The Atlantic published a string of stunning comments reportedly made by the commander-in-chief, Biden’s allies convened a call to recognize members of the military. The strategy represented a fuller and faster form of engagement from a campaign that, as a matter of principle, doesn’t respond to every Trump remark.

“Quite frankly, if what is written in The Atlantic is true, it is disgusting,” Biden said during a speech in Wilmington, Delaware on Friday afternoon. “It affirms what most of us believe to be true, that Donald Trump is not fit to be the commander-in-chief.”

Then he appeared more upset, saying it was the closest he’d come to losing his temper during the campaign.

“When my son volunteered and joined the United States military as the attorney general and went to Iraq for a year, won the bronze star and other commendations, he wasn’t a sucker,” the former vice president continued.

“The servicemen and women he served with, particularly those who did not come home, were not ‘losers.’ If these statements are true, the president should humbly apologize to every gold star mother and father and every blue star family that he has denigrated and insulted,” he said. “Who the heck does he think he is?”

The story has taken hold, in part, because it tracks with Trump’s past conduct. The president has likened his attempts to avoid sexually transmitted diseases as his “personal Vietnam,” proudly remarked that he likes “people who weren’t captured” when attempting to denigrate the late Sen. John McCain (R-AZ), and made the grieving widow of a soldier “cry even worse” after he called her.

Biden’s endorsers sought to remind reporters of his behavior earlier on Friday morning.

“I am not shocked to hear yet more instances of Donald Trump belittling the sacrifices of those who have shown more bravery than he is capable of,” Sen. Tammy Duckworth (D-IL), a former lieutenant colonel in the Army, said during an on-the-record briefing. “I’m not shocked, but I am appalled.”

Duckworth, who underwent two leg amputations after sustaining injuries in combat during the Iraq War, has been fiercely critical of Trump’s “downright contemptuous” attitude, she said, towards those who have sacrificed. “Of course he thinks about war selfishly. He thinks about it as a transactional cause.”

In the report by The Atlantic’s top editor, Jeffrey Goldberg, on Thursday night, Trump reportedly ridiculed soldiers who died as “losers” ahead of what was supposed to be an official trip to the Aisne-Marne American Cemetery in France in 2018, before he canceled it.

“Why should I go to that cemetery? It’s filled with losers,” Trump said, according to The Atlantic. “In a separate conversation on the same trip, Trump referred to the more than 1,800 Marines who lost their lives at Belleau Wood as ‘suckers’ for getting killed,” the story noted.

Khizr Khan, a gold star parent whose son was killed in Iraq, delivered a vehement denunciation of the president’s reported comments, while re-pledging his support for Biden.

“When Donald Trump calls anyone who places their life in service of others a ‘loser,’ we understand Trump’s soul,” Khan said. “By his accounting, self sacrifice does not make sense. Love does not make sense. According to Trump, the winners in life are those that put themselves before all. And losers are those that don’t. What kind of soul this man has. No wonder his words are meant to divide, sow hatred, degenerate those who sacrifice themselves for us.”

“His life is a testament to selfishness,” he added.

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