CUOMO: Sources tell CNN that that famous or infamous dossier, depending on your partisan stripe, that it was used by the FBI to help obtain a warrant to spy on a former Trump associate. Justice correspondent Evan Perez broke the story, along with two of his colleagues. Evan, what have you learned about the reporting? Let's remind people that means that the FBI saw on that dossier articulatable fact that they could give to a judge as a basis of reasonable belief about Carter Page. And the judge bought it.</s>EVAN PEREZ, CNN JUSTICE CORRESPONDENT: Good morning, Chris. That is exactly right. U.S. officials tell CNN that last year the FBI used a dossier of allegations of Russian ties to Donald Trump's campaign as part of the justification to get approval to secretly monitor Trump associate Carter Page. FBI director James Comey has cited the dossier in some of his briefings to members of Congress in recent weeks as one of the sources of information that the FBI has used to support its investigation. Now, this includes approval from the secret court that oversees the Foreign Intelligence Surveillance Act, known as FISA to monitor Page's communications. Now, to obtain court permission to target Page, the FBI and the Justice Department would have to present probable cause that he was acting as an agent of a foreign power, including possibly engaging in clandestine intelligence gathering for a foreign government.
Sources: FBI Used Russian Dossier to Get FISA Court Warrant for Page Investigation.