TETERBORO, N.J. — Republican Donald Trump announced a shakeup of his campaign leadership Wednesday, the latest sign of tumult in his bid for the White House as his poll numbers slip and only 82 days remain before the election.

The billionaire real estate mogul named Stephen Bannon of the conservative Breitbart News website as chief executive officer and promoted pollster Kellyanne Conway to campaign manager. Paul Manafort, Trump’s controversial campaign chairman, will retain his title, but it is unclear if his role will change.

In tapping Bannon for a top campaign role, Trump is doubling down on his outsider appeal rather than appeasing more traditional Republicans. The conservative Breitbart figure has been a cheerleader for Trump’s campaign for months and was critical of Republican leaders, including Ryan. Bannon is a former Goldman Sachs banker and does not bring presidential campaign experience to Trump’s White House bid.

Trump has resisted pleas from fellow Republicans to overhaul the flame-throwing approach on the campaign trail that powered his surge to the top of the Republican field in the primary season. Instead of working to broaden his appeal, Trump has largely hewed to the large rallies and attention-grabbing comments that appealed to the party base.

Conway joined Trump’s campaign earlier this year as a senior adviser. A longtime Republican strategist and pollster, she has close ties to Trump’s running mate, Indiana Gov. Mike Pence.

“I’ve known both of them for a long time. They’re terrific people, they’re winners, they’re champs, and we need to win it,” Trump told The Associated Press in a phone interview early Wednesday.