News of the president's call to the De Alencar family comes as Trump faces criticism for both falsely claiming past presidents did not personally reach out to the families of slain service members and for allegedly telling the widow of slain U.S. Army Sgt.
In the footage of the four-minute call, recorded by one of their four kids, Trump says he's sorry about "whole situation" and calls her husband "an unbelievable hero".
Ms. De Alencar told CNN that President Trump asked about her oldest son who is a college football player, and felt that the president understood their pain.
"It was a moment of niceness that we needed because we were going through hell", she said.
Melania Trump Presents Hervé Pierre-Designed Inaugural Gown to Smithsonian
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Natasha De Alencar describes her phone call with President Trump, who called her after her husband, Mark Rochetto De Alencar, was killed in action.
Sgt. De Alencar, 37, a Special Forces soldier, was shot and killed during an firefight involving ISIS militants. Trump asked her to say hello to them for him and to "tell them their father was a great hero that I respected".
The call came less than 24 hours after De Alencar watched her husband's body return from Afghanistan to Dover Air Force Base.
He left behind five children - Octavia, Deshaune, Rodrigo, Tatiyana and Marcos - and his wife of 15 years.
Four days after his passing, Natasha was sitting with a casualty officer when she received a phone call. And he invited her to make a visit to the White House.