During the campaign, President-elect Donald J. Trump swore he had “nothing to do with” a right-wing policy blueprint known as Project 2025 that would overhaul the federal government, even though many of those involved in developing the plans were his allies.

Mr. Trump even described many of the policy goals as “absolutely ridiculous.” And during his debate with Vice President Kamala Harris, he said he was “not going to read it.”

Now, as he plans his agenda for his return to the White House, Mr. Trump has recruited at least a half dozen architects and supporters of the plan to oversee key issues, including the federal budget, intelligence gathering and his promised plans for mass deportations.

The shift, his critics say, is not exactly a surprise. Mr. Trump disavowed the 900-page manifesto when polls showed it was extremely unpopular with voters. Now that he has won a second term, they say, he appears to be brushing those concerns aside.

“President-elect Trump has dropped all pretense and is charging ahead hand in hand with the right-wing industry players shaping an agenda he denied for the whole campaign,” said Tony Carrk, the executive director of Accountable.US, a watchdog group that has been tracking Mr. Trump’s cabinet picks with ties to the project.