Updated at 8 p.m. ET
He rose from relative state-party obscurity and reached an unlikely pinnacle as the man responsible for the agenda of the president of the United States.
Now, Reince Priebus is out of that job as White House chief of staff in the most significant shake-up of the rocky Trump presidency.
President Trump announced on Twitter on Friday that Homeland Security Secretary John Kelly has been named to replace Priebus, who says he resigned Thursday.