The application cited claims from the dossier that Mr. Page, while on a trip to Moscow in July 2016, had met with two senior Russian representatives and discussed matters like lifting sanctions imposed on Russia for its intervention in Ukraine and a purported file of compromising information about Mr. Trump that the Russian government had. (Mr. Page has denied those allegations, although he later contradicted his claims that he had not met any Russian government officials on that trip.)…

Visible portions showed that the F.B.I. in stark terms had told the intelligence court that Mr. Page “has established relationships with Russian government officials, including Russian intelligence officers”; that the bureau believed “the Russian government’s efforts are being coordinated with Page and perhaps other individuals associated with” Mr. Trump’s campaign; and that Mr. Page “has been collaborating and conspiring with the Russian government.”…

The application shows that the F.B.I. told the court it believed that the person who hired Mr. Steele was looking for dirt to discredit Mr. Trump. But it added that based on Mr. Steele’s previous reporting history with the F.B.I., in which he had “provided reliable information,” the bureau believed his information cited in the application “to be credible.”