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"We have decided that each side is going to take a course and we'll share and if the other side wants to participate they can. ... So we are going ahead with some things," Feinstein told reporters.

The fracture of what had been a bipartisan probe appears to spawn out of a GOP push to revisit Obama-era scandals and dig into a controversial opposition research dossier compiled on Trump. Democrats argue the committee should be focused on Russia's election interference and any potential collusion.

Feinstein, in addition to the Judiciary Committee's outstanding requests, submitted more than a dozen additional requests for information to McGahn.

Feinstein also wants press statements on Comey's firing and any documents from a White House meeting between Trump and Russian officials in May. The New York Times reported that Trump bragged during the meeting about firing Comey, who he called "crazy, a real nut job."

She is also asking for any documents tied to former Trump campaign chairman Paul Manafort, any communications from the Trump campaign's foreign policy team and all campaign communication tied to trying to "obtain, coordinate or otherwise use" information from Russian officials.

Feinstein is requesting that McGahn hand over information or statements on the July 2016 Trump Tower meeting, which included Jared Kushner, Donald Trump Jr., Manafort and a Russian lawyer.

The letter is one of five sent on Friday by Feinstein, who is up for reelection next year and facing a primary challenge from the left.

She's also asking Trump lawyer Michael Cohen to be interviewed by the Judiciary Committee next month, and provide communications with dozen of individuals and documents tied to Russia's election interference.

Feinstein sent additional requests for information on Friday to Facebook and Twitter, as well as Cambridge Analytica, a data mining and analysis firm that worked for the campaign

The two social media companies have also been wrapped into a separate probe by the Senate Intelligence Committee. Feinstein is a member of that panel as well.