There is racism in the Republican base, Vermont Sen. Bernie Sanders said during Tuesday night’s CNN Democratic town hall in Columbia, South Carolina.

“There was an effort to delegitimize the president … do I think in some parts of that Republican base there’s racism involved? Absolutely,” he said.

“Nobody has asked for my birth certificate. Maybe it’s the color of my skin,” Sanders said, referring to the birther movement that questioned President Barack Obama’s natural-born status in the United States.

Donald Trump was one of those who voiced concerns about why Obama delayed releasing his long-form birth-certificate. “I’m not a psychoanalyst and boy, would a psychoanalyst have an interesting time with Donald Trump,” Sanders said.

The South Carolina Democratic primary will likely be decided by the black vote. Though Hillary Clinton is leading, Sanders is capable of cutting into her lead.

Sanders is blasting radio-ads in South Carolina spotlighting his 1960’s-era activism during the Martin Luther King movement.

“You have my word,” Sanders said at the town hall, while vowing to increase funding for historically black colleges.

Breitbart News exclusively reported that the Clinton campaign is funding state parties in the South through wire-payments. The state party chairman in South Carolina, Jaime Harrison, works for the Podesta Group, a lobbying firm co-founded by Clinton campaign chairman John Podesta.