Trump-linked lawyer John Eastman had direct communication with former President Donald Trump about legal efforts to overturn the 2020 election, new court documents reveal.

Eastman, who crafted a legal strategy to overturn the 2020 election, also relied on "six conduits" to communicate with the former president and even received at least "two hand-written notes from former President Trump about information that he thought might be useful for the anticipated litigation."

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The revelations came from court documents in which Eastman's lawyers pleaded with a judge to shield roughly 600 emails from the House select committee investigating the Jan. 6 riot. The documents he is trying to keep hidden include communication about legal efforts to reverse the 2020 election and the two handwritten notes from Trump.

"Seventy-two of the documents over which Dr. Eastman has asserted attorney-client privilege are communications between Dr. Eastman (or Dr. Eastman and other attorneys on the Trump legal team) and one or more of six conduits to or agents of the former President with whom Dr. Eastman dealt," his lawyers wrote in a court filing late Thursday.

"While Dr. Eastman could (and did) communicate directly with former President Trump at times, many of his communications with the President were necessarily through these agents," the court brief continued.

Three of the conduits were part of Trump's "immediate staff," while the other three had "formal roles" in Trump's campaign committee. Some of his communications were subject to attorney-client privilege, lawyers said while refraining from disclosing too many details.

Some of the documents also include a bevy of communications he had with state legislators. Eastman's communication with state lawmakers has come under increased scrutiny following revelations that he presented a plan to a Pennsylvania state lawmaker for Pennsylvania to throw out absentee ballots to give Trump the lead.

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Earlier this year, the committee subpoenaed his former employer, Chapman University, in a bid to get access to his emails as part of its inquiry into the Jan. 6 riot and efforts to subvert the 2020 election. Eastman challenged the subpoena in court and was ordered to review over 94,000 pages worth of documents for privilege objections. He completed the review last month but attempted to shield roughly 20,000 other pages of documents.

In early May, the Jan. 6 committee withdrew objections to Eastman's privilege assertions over nearly 14,000 subpoenaed pages, leaving roughly 2,945 pages of emails in the legal crosshairs.