Donald Trump Jr. called veteran journalist Carl Bernstein, famous for his reporting on the Watergate scandal, a “leftist hack” on Sunday.

The president’s eldest son tweeted the jab at Bernstein and CNN’s chief national security correspondent Jim Sciutto for their report in July that said Trump’s longtime personal lawyer Michael Cohen was ready to tell special counsel Robert Mueller that President Trump signed off on Trump Jr. and campaign officials’ meeting with Russians in hopes of obtaining dirt on Hillary Clinton.