Rather than leave the matter alone, Trump responded to the interview on Twitter, saying he had a "very respectful" conversation with Johnson.
Myeshia Johnson, widow of Sgt La David Johnson, told ABC News that the US President made her cry as "he couldn't remember my husband's name" until he looked at a report in front of him.
Johnson said she was very upset and hurt when she got off of the phone, and that Trump's call made her cry even worse. Contradicting her, he added, "and spoke his name from beginning, without hesitation!"
Johnson also said she was still not able to see her husband's body and still has unanswered questions about what really happened in Niger.
Johnson said several people - including her aunt and uncle, an Army official and Wilson - heard the conversation because Trump was placed on speaker phone.
Sgt Johnson, 25, was killed along with three other U.S. soldiers in Niger when their group was ambushed by more than 50 Islamist militants on 4 October.
During a rare press conference on Thursday, White House Chief of Staff John Kelly appeared to confirm Trump's controversial remarks, but slammed Wilson for using the death of a fallen soldier to grandstand. "They won't show me a finger, a hand".
Trump vehemently denied Wilson's account, stating without evidence that he had proof it was "totally fabricated".
"Why couldn't I see my husband?"
Johnson said she wants the world to know "how great of a soldier my husband was". It could be empty for all I know. Trump in other tweets called her "wacky" and accused her of "SECRETLY" listening to the phone call. 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 risks his life for our country, why can't you remember his name? The couple also have a 2-year-old son and 6-year-old daughter.