An ethics chief for former President George W. Bush called Trump out on Wednesday for using the death of White House chief of staff John Kelly's son to push allegations that former President Barack Obama did not often call the families of fallen troops.

"I think we've seen over and over again that President Trump has no empathy for those who serve abroad in our wars, who have been captured like John McCain, or those who have been killed or the families of those who have been killed, in the case of Gen. Kelly," Richard Painter told the Hill.

He was responding to a report that Kelly didn't know that Trump would reveal that Obama had not called him after following his son's death while serving with the Marines in Afghanistan.

"He has no empathy, no understanding of human emotions that people go through because he stayed home during Vietnam with his sore foot or whatever it was," Painter said.

Trump is facing backlash for remarks he allegedly made during a phone call to he widow of a soldier who was killed in an in Niger.

According to Rep. Frederica Wilson, D-Fla., Trump told the widow that her husband "knew what he signed up for ... but when it happens it hurts anyway."

Trump has maintained that he did not make those comments and tweeted on Monday saying the lawmaker's story was "totally fabricated."