Whatever the reasons for Waltz being marginalized, Trump is rearranging the deck chairs on a badly listing ship and trying to do it in a way that doesn’t look bad for him. Part of that involves him consolidating two of the most important roles in the federal government — secretary of state and national security adviser — and giving them to Rubio.
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That’s the kind of loyalty Trump rewards. In order to cover the incompetence of his administration, the president is now consolidating power even further, giving two powerful positions to one sycophantic subordinate.