New York’s first Muslim mayor, Zohran Mamdani, has wasted no time and has addressed US President Donald Trump, officially launching a fight that will likely define the relationship between the 34-year-old mayor and the president, whose fame is tied to the city, Reuters reports.

“Since I know you're watching, I have four words for you: turn the volume up,” Democrat Mamdani said Tuesday evening while speaking to a cheering crowd shortly after being declared the winner—and addressing Trump.

The Democrats achieved three victories on Tuesday in the first major elections in the US since Trump returned to power nine months ago, promoting a new generation of leaders and giving new momentum to the embattled party ahead of next year’s congressional elections.

In his speech, Mamdani promised that he would fight against Trump.

Previously, the US president had repeatedly criticized Mamdani’s candidacy, accusing him of antisemitism and calling him a “communist.”