Attorney General William Barr says he doesn’t know if Robert Mueller supported his conclusion that the special counsel’s report had insufficient evidence to establish that President Donald Trump obstructed justice. The comment came as Maryland Sen. Chris Van Hollen asked Barr whether he agreed with Mueller’s assessment that there were “difficult issues” of law and fact concerning whether obstruction happened. Barr said in a March 24 letter that Mueller did not reach a conclusion on obstruction.