Donald J. Trump convened the first meeting of his national finance team on Thursday amid persistent Republican concerns that a shortfall in fund-raising efforts and a lack of discipline were imperiling his presidential bid.

During the gathering at the Four Seasons Hotel in Midtown Manhattan, Mr. Trump dwelled little on his recent controversies, including his comments about the Mexican heritage of the judge presiding in a lawsuit filed by former students of Trump University.

But a top Trump surrogate, Gov. Chris Christie of New Jersey, did allude to the recent bumpiness of the campaign, said an attendee, John A. Catsimatidis, a New York investor and grocery magnate.

“People make mistakes,” Mr. Christie said, according to Mr. Catsimatidis, “and they take it back.”

A spokesman for Mr. Christie referred questions to the Trump campaign.