Billionaire hedge fund manager Bill Ackman claimed Tuesday that Visa continues to process payments for Pornhub’s parent company, despite reportedly knowing it's “littered” with child pornography and holding the power to shut it down within hours. Ackman, the CEO of Pershing Square Capital Management, appeared on CNBC’s Squawk Box to throw his support behind a lawsuit alleging that Visa has helped Pornhub’s parent company, MindGeek, profit from child sexual abuse. “There have been hearings in Canada, around the world—people doing their best to shut down these companies. And the ultimate regulator is actually Visa,” Ackman said.