Page, 47, has denied being a Russian agent.
In a statement, she said: "Despite President Trump's repeated claims, these documents provide clear evidence of "Russia's co-ordination with Carter Page", a high-ranking Trump campaign official, "to undermine and improperly and illegally influence the 2016 U.S. presidential election". Republicans must get tough now.
Trump has repeatedly called that probe a "witch hunt" and a "hoax".
The documents released Saturday include the FBI's October 2016 request to surveil Page and several renewal applications. Federal Bureau of Investigation officials believed the Russian government's efforts to meddle in the election was coordinated through Mr. Page and perhaps other members of the Trump campaign.
Page, an American oil industry consultant who served as a foreign policy adviser to President Donald Trump as he was campaigning for president, has been under investigation by US intelligence agencies including the CIA, NSA and FBI, for alleged contact he has had with Russian officials under USA sanctions.
The application identified Page by name and said he had been the target of Russian government recruitment.
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"The FBI believes that Page has been collaborating and conspiring with the Russian Government", the surveillance application filed in October 2016 said.
Last week, a federal grand jury charged 12 Russian intelligence officers with hacking Democratic computer networks in 2016, in the most detailed U.S. accusation yet that Moscow meddled in the presidential election to help Trump.
The surveillance of Page became in February the subject of intense rivalry between lawmakers from Trump's Republican Party and their Democratic counterparts.
Reacting to the document's contents, Page - who was not charged for his so-called spying activities - told Ross he is "H$3 aving trouble finding any small bit of this document that rises above completely ignorance and/or insanity". White House officials have argued that Page, announced by the president in early 2016 as a foreign policy adviser, played only a minor role in the Trump campaign. He distanced himself from the Trump campaign in September 2016 while under scrutiny.
So far, the inquiry has indicted 32 people - mostly Russian nationals in absentia, but also three companies and four former Trump advisers. "You have an individual here who has openly bragged about his ties to Russia and Russians".
Rubio was referring to the so-called Steele Dossier, compiled by former British intelligence officer Christopher Steele, which alleged collusion between the Trump campaign and Russian Federation. The FBI warrants note that Steele released his findings to United States news organizations over admonishment of the FBI, and as a result, the bureau ended its relationship with him.