Roughly two months before New York City’s mayoral election, Zohran Mamdani has raised enough money to hit the $8 million fund-raising cap, his campaign said on Friday.

Mr. Mamdani, the Democratic nominee and the front-runner in polls, will announce the fund-raising achievement in a video on Friday morning, thanking his supporters and asking them to consider donating time to his campaign rather than money.

“We can’t take any more of your money,” he says in the video. “Truly, you need to stop.”

Mr. Mamdani’s three main rivals trail him in fund-raising. Former Gov. Andrew M. Cuomo, who is second in the polls, has about $1.5 million in his campaign account and will have to keep raising money in the weeks ahead.

Mayor Eric Adams, who is in fourth place in polls, has repeatedly been denied public matching funds and has about $4 million. Curtis Sliwa, the Republican candidate, has about $3.4 million.

Outside spending by super PACs could raise far more money to help one of Mr. Mamdani’s challengers. Many big donors have held back so far, strategizing over how best to oppose Mr. Mamdani, a state assemblyman and a democratic socialist.

Mr. Mamdani’s fund-raising milestone comes as President Trump moves to clear the field to try to defeat him. Mr. Trump said on Thursday evening that he wants to see just one candidate challenge Mr. Mamdani in a head-to-head competition.