WASHINGTON (AP) – Facebook has removed a campaign ad by President Donald Trump and Vice President Mike Pence that featured an upside-down red triangle. That symbol was once used by Nazis to designate political prisoners, communists and others in concentration camps. Nathaniel Gleicher, the company’s head of security policy, confirmed at a House Intelligence Committee hearing Thursday that the ad had been removed. He says Facebook does not permit symbols of hateful ideology “unless they’re put up with context or condemnation.”