Priebus is out
Donald Trump just said on Twitter he's replaced Chief of Staff Reince Priebus with Secretary of Homeland Security John Kelly.
The argument for Kelly, per Republican sources: He has a reputation for efficient management of complex organizations — one of the reasons he was picked as Secretary of Homeland Security. He has lots of experience leading large groups, and is a no-nonsense guy who can make the trains run on time. And he looks the part, always big with President Trump.