Paula White, a televangelist based in Florida and personal pastor to President Trump whom he has known since 2002, has joined the Trump administration in an official capacity, according to a White House official.

Ms. White will work in the Office of Public Liaison, the official said, which is the division of the White House overseeing outreach to groups and coalitions organizing key parts of the president’s base. Her role will be to advise the administration’s Faith and Opportunity Initiative , which Mr. Trump established last year by executive order and which aims to give religious groups more of a voice in government programs devoted to issues like defending religious liberty and fighting poverty.

As Mr. Trump campaigns for a second term, he cannot afford to lose support from the religious conservatives who voted for him in 2016 in significant numbers. Without their backing, his path to re-election would be significantly narrower.