He said Brockway's military background has been central to his identity since suffering the injury to his frontal lobe, which controls cognitive functions like judgement and problem solving.

Couple that injury, Jasper argues, with the president's calls to weed out those who have protested the national anthem or criticized the nation, and Brockway is no longer thinking for himself but responding to a presidential order.

"Obviously he (Brockway) owes a big portion of accountability for what took place, but it's certain that there was other things at work here that definitely contributed," he said.

Trump's rhetoric has varied in degrees of severity. In 2017, he told an Alabama crowd that he would "love" to see NFL owners punish, even fire, players who knelt during the national anthem. Videos of fans who agreed with the president subsequently posted videos burning their jerseys and memorabilia when teams refused to pull players who protested the anthem.

But Jasper said Wednesday he believes his client's condition means he can be "exploited" by such "animosity" from the president.