Mike Waltz’s ouster from the post of national security advisor followed months of White House frustrations over policy differences, particularly Iran strategy, per a Saturday report in the Washington Post.

Sources said Waltz’s addition of Jeffrey Goldberg, editor-in-chief of the Atlantic, to a Signal chat with sensitive national security information was the last straw in an already rocky relationship.

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Per the report, Waltz’s coziness with Israeli officials and eagerness to use military force clashed with President Donald Trump’s preference for diplomacy:

“If Jim Baker was doing a side deal with the Saudis to subvert George H.W. Bush, you’d be fired,” a Trump adviser said, referring to Bush’s secretary of state. “You can’t do that. You work for the president of your country, not a president of another country.”

Waltz is Trump’s nominee for UN ambassador. In the interim, Secretary of State Marco Rubio is serving as national security advisor.