“I don’t think this would be the first time his [Stephanopoulos’] impartiality has been questioned,” Paul said in a phone interview. “If you go back to the previous presidential debates, many people have brought up that the whole questioning about birth control was originated as a campaign theme by Stephanopoulos and there’s questions about whether that was done in coordination with Democrats. 

“It’s always hard to have someone be perceived as an objective arbiter on a debate if they spent most of their life as a partisan.”

On Wednesday morning, Brown said he had “concerns” over Stephanopoulos being the debate moderator in the wake of a report from Breitbart News that a top campaign adviser to incumbent Sen. Jeanne Shaheen (D-NH) has longtime ties to the former Bill Clinton campaign official and White House adviser.