Trump Organization head Eric Trump says he's a "big boy" but it bothers him when his wife is attacked online.
The statement comes on the heels of criticism from both right-wing media and Trump family members.
The president's son tweets support for their decisions to stop sponsoring the Public Theater in New York.
Forbes has reported that Trump charged his son's charity to use Trump Organization golf courses.
The U.S. has said it will not attend Moscow-led peace talks scheduled for Friday.
Trump, a Republican, is under pressure to distance himself from his businesses before he moves into the White House on Jan. 20.
Eric Trump decided that members on the resignation list would have to pay full dues.
Appearing on "CBS This Morning," Donald Trump's third child implied that sexual harassment is for weak women only—and also proved poor at math.
Instead of replacing Andrew Jackson on the bill, Trump wants to create another denomination for Harriet Tubman.
The billionaire's wife and three of his adult children will join him onstage Tuesday night.
A letter in the same envelope said Donald Trump should end his presidential campaign.