"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".
The Atlantic's reporting was based on anonymous sources but a "senior Defense Department official with first-hand knowledge of events" and a "senior U.S. Marine Corps officer who was told about Trump's comments" confirmed the cemetery comments to AP.
The White House said the visit was scrubbed because foggy weather made the helicopter trip from Paris too risky, and a 90-minute drive was deemed infeasible.
"Before I begin, I want to speak a little bit to what they talked about and the revelations about President Trump's disregard for our military and our veterans", he started.
One former Trump official, according to the Fox correspondent, said the president described American service members who fought in the Vietnam War as "suckers", she tweeted.
"It could have been a guy like John Kelly", Mr Trump told reporters, saying his former top aide "was unable to handle the pressure of this job".
In a nationally broadcast speech from his home state of DE, the former vice president seemed genuinely angry when talking about the president.
Mr Biden - former Vice President under President Barack Obama - brutalised Trump's comments as "disgusting", rhetorically asking "who the heck does he think he is?" and adding that Trump is "not fit to be commander-in-chief". There is nobody that respects them more. "You don't know what it is to sacrifice", says one.
Biden, who is ahead in national polls but whose lead is tighter in all-important swing states including Pennsylvania, signaled he would share the stage with Trump in Shanksville if invited to do so.
In 2015, shortly after launching his presidential candidacy, Mr Trump publicly blasted McCain, saying, "He's not a war hero". John McCain as a "loser" because he was captured during the Vietnam War, and used the same language to talk about how the late President George H.W. Bush was shot down as a Navy pilot during World War II. "I like people that weren't captured".