WASHINGTON (AP) — President Donald Trump lent credence Thursday to reports that FBI informants had infiltrated his presidential campaign, saying that "if so, this is bigger than Watergate!"

Trump made the comment on the anniversary of Robert Mueller's appointment as special counsel to head the Justice Department investigation into possible coordination between Russia and Trump campaign official. Trump has repeatedly called the investigation a "witch hunt."

"Wow, word seems to be coming out that the Obama FBI 'SPIED ON THE TRUMP CAMPAIGN WITH AN EMBEDDED INFORMANT,'" Trump tweeted. "Andrew McCa...