Cowanda Jones-Johnson, the mother of the Army sergeant who was killed in Niger earlier month, on Wednesday confirmed Democratic Rep. Frederica Wilson's account of what President Trump said on the phone following her son's death.

When asked if Wilson's account β€” that Trump told the widow, Myeshia Johnson, her husband "knew what he signed up for" β€” was true, Jones-Johnson told the Washington Post "yes."

Update: Trump: 'I did not say what that congresswoman said' in call with soldier's widow

The mother said she was in the car with her daughter-in-law when Trump called to express his condolences about the death of Army Sgt. La David Johnson. The family was riding in a limousine at the time and the widow put the conversation on speakerphone for everyone to hear.

"President Trump did disrespect my son and my daughter and also me and my husband," Jones-Johnson added.

Wilson told MSNBC on Wednesday "she was crying the whole time, and when she hung up the phone, she looked at me and said, β€˜He didn't even remember his name.' That's the hurting part."

Earlier Wednesday, Trump said he has proof Wilson lied about the contents of the phone call.

"Democrat Congresswoman totally fabricated what I said to the wife of a soldier who died in action (and I have proof). Sad!" Trump tweeted.

Wilson denied Trump's claim and she has proof of the conversation.

"I don't know what kind of proof he could be talking about," Wilson said Wednesday on CNN. "I'm not the only person that was in the car. And I have proof too. This man is a sick man. He's cold-hearted and he feels no pity or sympathy for anyone."