Democratic New York City Mayor Bill de Blasio’s campaign zeroed in two of the donors to his likely Republican opponent Nicole Malliotakis: Robert and Rebekah Mercer.

Both Mercers are prominent donors to Republican causes, invested in Breibart News and are backers of President Donald Trump.

In a fundraising email, the de Blasio re-election campaign highlighted their support for Malliotakis.

“If you don’t know who they are, they are two of the biggest donors to Donald Trump’s presidential effort and helped place Steve Bannon on the campaign and in the White House. But more than that, they are key funders of the alt-right movement who have given millions of dollars to sustain the Breitbart news empire and even funded Milo Yiannopoulos’s speaking tour,” the email states.

“Their pockets have no bottoms. Robert Mercer even has a multi-million dollar train set, so one can only imagine the value they place on putting a Trump acolyte at the helm of the largest and most diverse city in America. We’re gonna need your help.”

De Blasio has sought to link Malliotakis to Trump in previous fundraising emails, including a tweeted picture of the two from a meeting in 2013. No matter who the Republican nominee would have been, it’s a strategy de Blasio was almost certain to deploy in his re-election bid for a second term.