Corey Lewandowski, Trump’s first campaign manager, requested that Trump submit himself to a forensic evaluation that is traditional for any public figure seeking office, according to people granted anonymity to speak freely about the campaign’s start-up days last year. Opposition research would allow Trump’s new political team to prepare for potential attacks on his candidacy.

Paul Manafort and his team made a similar request when they took over the reins after Lewandowski, who was ousted this June.

Trump declined, the people said, and the issue became a point of contention among his closest political advisers and some long-time employees at the Trump Organization. Trump spokespeople Jason Miller and Hope Hicks didn’t immediately respond to requests for comment.