He creates — or threatens to create — a calamity, and then insists he will address the problem only if his adversary capitulates to a separate demand.

Trump has described this approach as creating leverage and negotiating, but Democrats and other opponents have said it amounts to “hostage taking.”…

He imposed tariffs on steel and aluminum imports from a host of nations, saying it was necessary to force changes in other countries’ trade practices. He threatened to rip up the North American Free Trade Agreement if Canada and Mexico didn’t agree to a new trade deal, a move that potentially could have crippled both of their economies…

“It’s a Trumpian way of negotiating,” longtime friend Larry Kudlow told a radio interviewer last year before joining the White House. “You knock them in the teeth and get their attention. And then you kind of work out a deal.”