EXCLUSIVE: Donald Trump says he "regretted not serving in many ways"

Amid a feud with the family of a fallen soldier and questions over his Vietnam deferments, Republican presidential nominee Donald Trump campaigned in Northern Virginia Tuesday.

Kellie Meyer was the only reporter to talk to Trump following his campaign rally at Briar Woods High School in Ashburn.

Trump is facing criticism for not going to Vietnam and previously saying he felt “lucky" not to have served. Kellie asked Trump about it in her exclusive one-on-one interview.

“I’ve regretted not serving in many ways," said Trump.

Trump also said he was “fortunate” not to have to go to Vietnam, but that he missed out.

"We were in a very highly contested and unpopular war," said Trump. "It is also something I missed. But I helped build the Vietnam Memorial in Downtown Manhattan. To me, that was an important thing to do."

Trump pulled out Purple Heart one veteran gave him at his rally saying he’s had a “great relationship” with veterans. But not all the vets who showed up are behind the Republican nominee.

“Do I believe that he regrets not serving? I doubt it very seriously," said Capt. Terrone Sims II.

Sims was just one of the dozens of people protesting outside the venue condemning Trump for not apologizing to the Khan family from Charlottesville, Virginia.

Mr. Khan spoke at the Democratic National Convention about losing his son in the Iraq War and saying Trump never made any sacrifices.

Trump said it was a "vicious attack" and implied Mrs. Khan was not allowed to speak because of her religion.

Despite their calls for an apology, Sims doesn’t expect one.

"His whole life he hasn’t had to apologize for anything, so why should he?" said Sims.

Regarding the protesters outside the event, Trump responded, "I haven’t seen protestors. I’ve only seen people very much in support of what we’ve done.

President Obama Tuesday called Trump "unfit" to be president.

But Trump says the president calling him out is almost an honor, because he says President Obama truly doesn’t know what he’s doing.