As of the most recent available filings, there have been more than 3,000 contributions from Long Islanders, totaling at least $2.85 million of the roughly $51 million so far in the race. Nearly 40% of the Long Island money comes from five ZIP codes clustered on the Gold Coast of Nassau County.

The possibility that the president will seek to intercede could inject an element of unpredictability into an already fractious contest.

Former New York Gov. Andrew Cuomo on Thursday denied speaking with President Donald Trump or seeking his help in the upcoming New York City mayoral election a day after a New York Times report said the two men had spoken on the phone.