The widow of Army Sgt. La David Johnson said she was “very angry” about President Trump’s condolence call because he struggled with the soldier’s name, she told Good Morning America on Monday.

"Yes, the president said that he knew what he signed up for, but it hurts anyway. And it made me cry cause I was very angry at the tone of his voice and how he said he couldn’t remember my husband’s name," Myeshia Johnson said.

"I heard him stumbling on trying to remember my husband’s name and that’s what hurt me the most, because if my husband is out here fighting for our country and he risked his life for our country why can’t you remember his name," Johnson added. "And that’s what made me upset and cry even more because my husband was an awesome soldier."

HIS STORY: Who was Sgt. La David Johnson?

But Trump tweeted Monday that he had a respectful conversation with the widow and spoke the soldier's name without hesitation.

Johnson was one of four soldiers killed in an ambush by extremists in Niger on Oct. 4. Few details about the attack have been released publicly, which sparked a political firestorm.

Marine Corps Gen. Joseph Dunford Jr., chairman of the Joint Chiefs of Staff, told reporters Monday that the Defense Department is investigating the circumstances of how the four troops were killed.

Dunford said the investigation could take several weeks and that he couldn’t say yet why Johnson was separated from others and not recovered for two days. Questions to be resolved include whether the mission changed, and whether the troops had adequate weapons and training, he said.

The troops weren't expecting to run into the enemy, Dunford said. About an hour after an initial firefight, the soldiers requested air support, which arrived in the form of French military aircraft about a half-hour later, Dunford said. That delay might have suggested that the troops thought they could deal with the initial contact on their own, but Dunford said the reason for the delay wasn’t clear yet.

“We owe the families as much information as we can find,” he said. “These are all fair questions this investigation is designed to identify.”

NIGER FALLOUT EXPLAINED: John Kelly, Rep. Wilson and how we got here

Rep. Frederica Wilson, D-Fla., criticized Trump’s condolence call to the widow while the women were headed to Dover Air Force Base to recover the body.

"I heard him say, 'Well I guess you know he knew what he was signing up for, but it still hurts,'" Wilson told ABC News.

Trump called the congresswoman’s description a "total fabrication."

John Kelly, a former four-star Marine general who is now White House chief of staff, said Thursday that he was stunned and brokenhearted to hear Wilson's criticism. Kelly said the soldier's sacrifice must be kept sacred.

But Johnson said Monday that "what (Wilson) said was 100% correct."

In a debunked Facebook post, a user posted a photo of the couple as the account’s profile picture and said Wilson only heard part of the conversation.

“I want to set the record straight. I’m getting sick and tired of this so called politician using my husband as a political platform,” the user posing as Myeshia Johnson wrote.

But the time-stamp on the post said 3:27 p.m. Tuesday and Trump called at 4:45 p.m.

Johnson confirmed for ABC News that she didn't write the post and that it is fake, according to Michael Del Moro, a producer for Good Morning America.

Johnson also said she wants to know more about how her husband died and why his body wasn't recovered for 48 hours. She said she wasn’t allowed to look in his casket when it arrived.

FUNERALS:1,200 mourn the 4 Americans killed in Niger

“I need to see him so I know it’s my husband,” she said. “They won’t show me a finger, a hand; I know my husband’s body from head-to-toe and they won’t let me see anything.”