The Times editorial board offers detail on why Bolton will be dangerous.

The national security adviser is the person who makes sure the president hears the views of all the national security agencies, including the State Department and Defense Department, and drives policy toward a decision. It is hard to see Mr. Bolton playing the honest broker. Mr. Bolton is known to play a ruthless inside game as he maneuvered to win bureaucratic battles and freeze out people he thinks crossed him. He has been such a lightning rod that he couldn’t get confirmed as United Nations ambassador in 2005 so President George W. Bush gave him a recess appointment, and he stayed in the job about a year. It was considered unlikely that the Senate could have confirmed him as secretary of state, but the national security adviser job doesn’t require confirmation.

Bringing on the fiery Mr. Bolton now, at a delicate moment with North Korea, is a terrible decision. While Mr. Trump has often threatened North Korea with military action, he accepted Mr. Kim’s invitation to a summit, brokered by South Korea’s president, who is eager for a diplomatic solution to the nuclear crisis.

Mr. Bolton, by contrast, told Fox News earlier this month that talks would be worthless and has called South Korean leaders “putty in North Korea’s hands.” On February 28, he insisted in a Wall Street Journal op-ed that “it is perfectly legitimate for the United States to respond to the current ‘necessity’ posed by North Korea’s nuclear weapons by striking first.”

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