Shine called his eight-month stint in the White House "the most rewarding experience of my entire life". Earlier this week, the Trump campaign announced it was beefing up its communication team with more hires.
While the split appeared amicable, with Shine going on to work for Trump's campaign, several reports said that the White House communications director had not been meeting the president's expectations.
Shine, 55, was appointed co-president of Fox News in August 2016, following the abrupt resignation of its chief Roger Ailes in the face of a sexual harassment lawsuit.
Move is a surprise, even by Trump administration standards, though a red flag went up when Shine did not accompany POTUS to Vietnam to meet with North Korean ruler Kim Jong Un, as was planned.
Shine was the fifth person to serve as the White House communications director in Trump's two years in office.
While Shine, the White House and the Trump campaign all said the right things, it was immediately clear to anyone paying even the slightest attention to this administration that Shine's departure was the result of a desire by Trump to be rid of the longtime Fox News Channel senior staffer. "To be a small part of all this President has done for the American people has truly been an honor", he said in a statement.
Trump praised Shine in a statement Friday for an "outstanding job", saying he looked forward to working with him on the campaign, where he expects him to be "totally involved".
"Recent reporting in the New Yorker on the inappropriate relationship between President Trump, his administration and Fox News has led me to conclude that the network is not in a position to host a fair and neutral debate for our candidates", he added in a statement to The Washington Post.
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