Don Black, the founder of the prominent white supremacist website Stormfront, told Politico for an article published Thursday that his site and radio show have gotten a huge boost during Republican presidential candidate Donald Trump’s campaign.

Black told the publication that Stormfront’s traffic increases by about 30-40 percent when Trump makes waves with his comments on immigration and Muslims. It’s enough of a bump that Black said he now has to upgrade his servers.

Trump has demonized immigrants from Mexico repeatedly while on the campaign trail. On Monday, he called for a “total and complete shutdown” of Muslims entering the United States. Such remarks have proven to be attractive to white nationalists, and when asked about the support he has from white supremacists like David Duke, the notorious former Ku Klux Klan leader, Trump has said “everybody likes me.”

Black said Trump was creating a legacy for white nationalists that will outlive his political career.

“Demoralization has been the biggest enemy and Trump is changing all that,” Black told Politico. “He’s certainly creating a movement that will continue independently of him even if he does fold at some point.”

Read the full report here.