This is source I found from another site, main source you can find in last paragraph
Ms. Johnson, above at Sergeant Johnson’s funeral on Saturday, said in a televised interview that Mr. Trump did not even seem to know her husband’s name. “It made me cry because I was very angry at the tone in his voice and how he said it,” she said.
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Mr. Trump responded on Twitter that he “spoke his name from beginning, without hesitation!”