President Donald Trump speaks during a news conference last month with Elon Musk amid fractures in their alliance. (Tom Brenner/For The Washington Post) By Cat Zakrzewski , Natalie Allison , Elizabeth Dwoskin , Jeff Stein and Emily Davies

President Donald Trump was dejected, processing his very public split with the world’s richest man.

Rattled in the wake of Elon Musk’s public attacks and apparent call for his impeachment, Trump worked the phones, debriefing close confidants and casual acquaintances alike. His former ally was “a big-time drug addict,” Trump said at one point as he tried to make sense of Musk’s behavior, according to a person with knowledge of the call, who like others interviewed for this story spoke on the condition of anonymity to discuss sensitive matters.

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