“I view this president and his conduct as the greatest threat to the democratic system and to the constitutional government since the Civil War,” Nadler said in an interview with radio host John Catsimatidis on AM 970 in New York. “Whether it’s threatening the newspapers or threatening the judiciary or calling people who criticize him treasonous.”

Nadler, one of the Democratic chairmen set to probe various aspects of the Trump administration, said the House will soon be holding hearings including into “abuse of power” and “obstruction of justice.”

“Clearly…there have been major abuses of power, major obstruction of justice, obvious violations of the emoluments clause of the Constitution,” he said. “All of these have to be looked at.”