The shakeup of Trump's campaign staff continued today as Paul Manafort, the campaign CEO, resigned his position.

Politico:

"This morning Paul Manafort offered, and I accepted, his resignation from the campaign. I am very appreciative for his great work in helping to get us where we are today, and in particular his work guiding us through the delegate and convention process. Paul is a true professional and I wish him the greatest success," Trump said in a statement.

Trump’s campaign on Wednesday announced a shakeup, its second in as many months, with the addition of Breitbart executive Stephen Bannon as campaign CEO and the promotion of pollster Kellyanne Conway to campaign manager.

Trump’s camp framed the moves as an expansion rather than a shakeup, but they were widely seen as a demotion for Manafort, who has come under fire for his ties to pro-Russian Ukrainian politicians and oligarchs.

In a statement Wednesday, Manafort hailed the additions as “respected professionals” who “will undoubtedly help take the campaign to new levels of success.”

Manafort proved to be an inspired hire at the time.  He professionalized Trump's delegate-wrangling operation and oversaw the GOP convention, considered a success by most observers.  But Manafort lost influence with Trump because he believed that Trump had to "pivot" to be more presidential.  The hiring of Bannon and Conway, who have been strong voices for Trump not to change, sealed his fate.

The Washington Post is reporting that Manafort will remain on friendly terms with the candidate and the campaign and will be tapped for advice from time to time.