The Service Employees International Union — fresh off its endorsement this week of Democratic presidential frontrunner Hillary Clinton — is launching a multimillion dollar advertising campaign blasting GOP candidates for their “anti-immigrant attacks.”

The campaign will target Republicans like Donald Trump, Marco Rubio, Ted Cruz, and Jeb Bush, who have suggested rolling back the Obama administration’s immigration policies.

It is timed to run over the one-year anniversary of the president’s controversial executive order allowing millions of illegal immigrants to live in the U.S.

“One year ago, President Obama took historic action, standing up for all families striving to achieve the American Dream,” SEIU International executive vice president Rocio Saenz said in a statement. “Since then, we have reached one full year of consistent attacks against Latino and immigrant families. It’s simply inexcusable.”

The SEIU will run the ad beginning Thursday. A Spanish language version will run nationwide on Univision and Telemundo during the Latin Grammy Awards. An English version will run online in Texas, Nevada, Colorado, and Florida.

The SEIU is spending “six-figures” on the ad, which is part of a larger multimillion campaign for immigration reform.

The GOP presidential hopefuls will be scolded for their “radical and hateful language against immigrant communities.”

The ad opens with news clips of Cruz, Rubio and Trump calling for more restrictive immigration policies, then shoots to a voice-over: “Now, it’s time for our community to say no. We will not accept hate. We will not allow anti-immigrant attacks.”