But Trump’s style has also clearly foundered with North Korea, which has continued to expand its missile and nuclear programs despite his alternating threats to incinerate Pyongyang or make it the next Singapore. His “deal of the century” between Israel and the Palestinians has yet to be unveiled, and Iranian leaders have so far resisted his entreaties to negotiate as well as his campaign of “maximum pressure.”

Then there is Washington, where the policy process often moves slowly and there are laws governing what officials can and can’t do and how regulations can be written.

Here, his operating style has caused problems.

As the head of an eponymous family business, Trump was accustomed to making almost every major decision. It’s been hard for him to adapt to the sprawling and sometimes willful federal bureaucracy, where decisions can get slow-rolled, altered or simply ignored as they filter their way down the organizational chart.

Officials have frequently boasted to reporters about how they’ve thwarted Trump’s whims, as with his orders to assassinate the president of Syria, or pull out of NATO, or build a border moat filled with snakes or alligators.

One of them — an anonymous senior official styling himself as the leader of a cadre of “adults in the room” within the administration —has even parlayed a New York Times op-ed touting his “resistance” into a book on the same subject.

Some foreign leaders — notably Japan’s Shinzo Abe — have learned to adapt to Trump by reading “The Art of the Deal,” which lays out his favorite negotiating and strategy tactics.

But others have learned, to their chagrin, that it can be surprisingly easy to persuade Trump to adopt their positions — only to discover later that his commands don’t always get executed.

After Trump tweeted in August that he had ordered U.S. companies look for an alternative to manufacturing goods in China, for instance, staffers told reporters that Trump hadn’t issued any official order, explaining that the president was only warning companies to pull back from China.