Overseas, the administration is stumbling toward war with Iran, ordering and then canceling an attack. Iran on Tuesday said the White House is “afflicted by mental retardation,” and Trump responded by threatening Iran with “obliteration.”

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Here in Washington, Trump just appointed a new press secretary for the third time and a White House communications director for the seventh time. He refuses to say whether he has confidence in his FBI director, his third, and he’s publicly feuding with the Federal Reserve chairman he appointed over whether Trump can fire him. Meantime, Trump is defying a Trump-appointed watchdog who called for the firing of White House counselor Kellyanne Conway for illegal political activities, and he’s brushing off the latest credible accusation of sexual misconduct by saying the accuser is “not my type.” And Trump’s protocol chief is quitting on the eve of the Group of 20 summit, Bloomberg News reported Tuesday, amid allegations that he carried a whip in the office.

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The chaos takes on many forms, but most of it stems from a single cause: Trump’s determination to run the country like “The Apprentice.”

The common thread to the mayhem and bungling is Trump’s insistence on staffing his government with officials serving in temporary, “acting” roles at the pleasure of the president and without the stature or protection of Senate confirmation. This allows Trump to demand absolute subservience from appointees. Because he can replace them at will, they don’t contradict him. But this tentative status also means they lack authority within their agencies and the stature to stand up to Trump when he’s wrong.

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It’s no mere coincidence that the border debacle is the work of Trump’s Homeland Security Department, where every major border- and immigration-related agency is led by an “acting” official. Trump’s acting commissioner of the U.S. Customs and Border Protection, John Sanders, just resigned after only two months on the job. The Post’s Nick Miroff and Josh Dawsey report that he will be replaced by the current acting director of U.S. Immigration and Customs Enforcement, Mark Morgan (who got the job after praising Trump’s policies on Fox News). Morgan, in turn, has only been on the job for a couple of months since Trump fired yet another acting director of ICE. Trump had also ousted his DHS secretary and his head of the U.S. Citizenship and Immigration Services, and he has tabbed an “immigration czar” who has not yet accepted the job.

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It’s no mere coincidence, either, that the Iran debacle is occurring at a time when the Pentagon has been leaderless since Jim Mattis resigned as defense secretary in December. Patrick Shanahan had been the longest-serving “acting” defense secretary in history until last week, when Trump named another acting secretary, Mark Esper. Both men were reportedly with Trump when he ordered the Iran attack, which he later canceled after learning about possible casualties. It’s hard to imagine Trump ordering up a military attack on Mattis’s watch without first getting a casualty estimate.

And it’s no mere coincidence that the man at the fulcrum of chaotic White House decision-making, chief of staff Mick Mulvaney, also serves in “acting” status. Politico’s Nancy Cook reports that Trump is tiring of Mulvaney (he had the nerve to cough during a Trump TV interview), though he might not yet replace him with a fourth chief of staff, because he likes Mulvaney’s “hands-off approach” to Trump’s “whims and decision-making style.” If he weren’t “hands-off,” he’d be fired.

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Trump is unabashed in his preference for this “Apprentice”-style, “you’re fired” leadership. It’s a theme of a new book about Trump’s Cabinet, “The Best People,” by Yahoo News national correspondent Alexander Nazaryan. Of his fondness for acting officials, Trump told Nazaryan: “It gives me a lot of leeway. It gives me great flexibility. I do like it. It’s such a big deal to get people approved nowadays. . . . We have actings, and we’re seeing how we like them.”

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In other words, the administration is run by people on perpetual tryout, perpetual probation, unable to make long-term plans or to command the respect of those they (nominally) lead. The Federal Aviation Administration, which botched its handling of the Boeing 737 Max crashes, has been led by acting officials. The Consumer Product Safety Commission, which bungled the recall of Fisher-Price’s Rock ’n Play bassinet, has been run by an acting chairwoman. (She announced last week she will step down at the end of her term in October.)

Now, Trump’s “actings” are causing babies to go hungry, and they may soon bumble us into war with Iran. But that’s okay, because Trump likes the “flexibility.”

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Twitter: @Milbank