For once, President Donald Trump was trying to be the adult in the room.

Trump and Elon Musk, two billionaires with massive egos and combustible temperaments, had forged an unlikely friendship over the past year, one built on proximity, political expediency, and, yes, a touch of genuine warmth. Relations between the president and his top benefactor had grown somewhat strained in recent weeks, as Trump began to feel that Musk had overstayed his welcome in the West Wing. Musk had suggested privately that he could stay on at the White House, an offer that Trump gently declined, two people familiar with the situation told us. (They, like others we talked with for this story, spoke anonymously in order to share candid details about a sensitive feud.) But Musk was still given a gracious send-of

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