James Comey, the man who refused to bring charges against Hillary Clinton despite a mountain of concrete evidence that she, and several members of her staff, knowingly violated several federal laws, apparently used the largely discredited "Trump Dossier" to help secure a FISA warrant to secretly monitor Trump's former campaign aide, Carter Page, according to CNN.
Among other things, the dossier alleged that Page met senior Russian officials as an emissary of the Trump campaign, and discussed quid-pro-quo deals relating to sanctions, business opportunities and Russia's interference in the election. Page has denied meeting the officials named in the dossier and says he never cut any political deals with the Kremlin. Per CNN:
The FBI last year used a dossier of allegations of Russian ties to Donald Trump's campaign as part of the justification to win approval to secretly monitor a Trump associate, according to US officials briefed on the investigation.
The dossier has also been cited by FBI Director James Comey in some of his briefings to members of Congress in recent weeks, as one of the sources of information the bureau has used to bolster its investigation, according to US officials briefed on the probe.
This includes approval from the secret court that oversees the Foreign Intelligence Surveillance Act (FISA) to monitor the communications of Carter Page, two of the officials said. Last year, Page was identified by the Trump campaign as an adviser on national security.