WEST PALM BEACH, Fla. — One of President-elect Donald Trump’s top aides said unexpectedly early Saturday evening that he would not be joining the White House staff as previously announced because he wants to spend more time with his family.

Jason Miller, a senior adviser to Trump’s campaign who was named Thursday as the White House communications director, said in a statement that he had decided that the West Wing job would be too demanding and that his growing family was more important.

“After spending this past week with my family, the most amount of time I have been able to spend with them since March 2015, it is clear they need to be my top priority right now and this is not the right time to start a new job as demanding as White House Communications Director,” Miller said in a statement.

He added: “My wife and I are also excited about the arrival of our second daughter in January, and I need to put them in front of my career. I look forward to continuing to support the President-elect from outside after my work on the Transition concludes.”

Miller’s decision was first reported by Politico. The statement was issued by Miller personally and not by the Trump transition team.

Sean Spicer, a veteran GOP operative who was named White House press secretary, will take over what were expected to be Miller’s duties and will also have the title of communications director, Miller said in the statement.

Spicer will be accompanied in the White House communications shop by Hope Hicks, Trump’s longtime spokeswoman, who will be director of strategic communications, and Dan Scavino, the campaign’s director of social media, who will have the same role at the White House.

Miller joined Trump’s campaign as senior communications adviser shortly before the Republican National Convention and oversaw the campaign’s communications operation throughout the general election. He has continued in that role during the transition, sharing lead spokesman duties with Spicer.

Before joining the Trump campaign, Miller served as a top communications adviser on the presidential campaign of Sen. Ted Cruz (R-Tex.). He has a long history in Republican politics and has worked as a political consultant at Jamestown Associates.