Rep. Tom MacArthur, R-N.J., said Thursday the U.S. Capitol Police traveled to New Jersey this week to arrest a man suspected of threatening MacArthur's life.

"Like a lot of members, I've had a number of death threats and one of them was serious enough that the Capitol Police went to New Jersey yesterday and they arrested somebody," MacArthur said.

MacArthur declined to provide more details.

The Capitol Police have not yet responded to a request for a comment from the Washington Examiner.

MacArthur, who is serving his second term, has been a pivotal negotiator in the healthcare debate and is the author of a key amendment in the House-passed measure that would allow states to seek waivers from many Obamacare mandates.

He said the death threats began in response to his much-publicized involvement in the effort to repeal and replace Obamacare.

"It started over healthcare," MacArthur said of the threats. "They are serious, and they are ramping up."

The police, MacArthur said, "put this one through their threat assessment unit and they simply alerted my office that this one rose to a level where they had to act."

MacArthur said he does not know if the man is in jail, or what, if any, prosecution is planned.

Earlier this month, James Hodgkinson of Belleville, Ill., who espoused angry feelings about the Republican Party, opened fire with a high-powered rifle at Republican lawmakers practicing for a baseball game in Alexandria. Six people were injured during the incident.

Majority Whip Steve Scalise, R-La., who was grievously wounded, remains hospitalized.

MacArthur urged people to "tone down the rhetoric, the angst."

He said, "I get there are going to be policy disagreements, but it's not helpful if people ascribe bad motives to me, and it's not helpful if we ascribe bad motives to other people."