Corey Lewandowski, former President Donald J. Trump’s first campaign manager, who was ousted from that campaign in 2016 and then from a pro-Trump super PAC in 2021, has been hired as an adviser for the Republican Party’s nominating convention in July, a person familiar with the decision said.

Mr. Lewandowski, a longtime political adviser to Mr. Trump, was pushed out of a pro-Trump super PAC that he had helped lead — Make America Great Again Action — in 2021 after the wife of a donor accused him of making unwanted sexual advances. A spokesman for Mr. Trump said at the time that Mr. Lewandowski would “no longer be associated with Trump World.” His hiring for the Republican National Convention, which will be held in mid-July in Milwaukee, represents his return to Mr. Trump’s circle of political advisers.

The hiring was first reported by National Review, and Chris LaCivita, a top official in the Trump campaign, told the conservative outlet that Mr. Lewandowski was “very helpful to me, and he’s helpful to the R.N.C., and he’s helpful to the president.”

This month, Paul Manafort, who replaced Mr. Lewandowski as Mr. Trump’s campaign manager in 2016, stepped down from a similar role advising the nominating convention, saying that “the media wants to use me as a distraction to try and harm President Trump and his campaign.” Mr. Manafort was convicted of a range of financial crimes and conspiracy to obstruct justice and spent nearly two years in prison before Mr. Trump pardoned him in December 2020.