What do you think? Leave a respectful comment.

WATCH: Trump reacts to intel director’s hearing on whistleblower complaint

President Donald Trump is lashing out at House Democrats amid an impeachment investigation and a whistleblower complaint over his efforts to pressure Ukraine to investigate Democratic rival Joe Biden.

Speaking to reporters Thursday after returning to Washington from meetings at the U.N. General Assembly, Trump says of the probes, “There should be a way of stopping it, maybe legally through the courts.”

Trump is calling Thursday’s hearings on the whistleblower complaint, “a terrible thing for our country.” And he claims House Speaker Nancy Pelosi “has been hijacked by the radical left” in her pursuit of impeachment.

Trump later in the day threatened the person who gave information to the whistleblower as he spoke at a private event in New York with staff from the U.S. mission to the United Nations.

“I want to know who’s the person, who’s the person who gave the whistleblower the information? Because that’s close to a spy,” Trump said. “You know what we used to do in the old days when we were smart? Right? The spies and treason, we used to handle it a little differently than we do now.”

The remarks were reported by The Los Angeles Times and The New York Times.

WATCH: Acting intel director Maguire’s full testimony on Trump whistleblower complaint