Washington (CNN) White House deputy chief of staff and de facto communications director Bill Shine has stepped down to join the Trump campaign, press secretary Sarah Sanders announced in a statement Friday.

Shine, a former Fox News executive, joined the White House in July 2018, the sixth person to fill or be tapped for the top communications role. Jason Miller, Sean Spicer, Mike Dubke, Anthony Scaramucci and Hope Hicks all came before him.

He offered his resignation to President Donald Trump on Thursday but was spotted on the White House South Lawn on Friday ahead of the President's trip to Alabama. He will be joining the 2020 re-election campaign as a senior adviser.

"Serving President Trump and this country has been the most rewarding experience of my entire life. To be a small part of all this President has done for the American people has truly been an honor. I'm looking forward to working on President Trump's re-election campaign and spending more time with my family," Shine said in a statement.

Shine's effectiveness inside the West Wing came with mixed results and it was unclear how much he was able to change the White House's communications strategy. One source close to the White House told CNN that Trump had questioned Shine's judgment on a number of issues in recent months, from the midterm election to the government shutdown.

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