Why President Trump Fired Rex Tillerson

It wasn’t the disagreement over moving the U.S. embassy to Jerusalem, the wisdom of direct talks with North Korea or even the very clear split with the President over Russia’s aggression. In the end, calling Donald Trump a “moron” last year — and the broader personality clash it represented — was what cost Secretary of State Rex Tillerson his job on Tuesday.

The move could mark the start of a broader purge.