A former Trump lawyer is suing Verizon to stop it from looking at his phone history.

John Eastman, an attorney who helped then-President Donald Trump attempt to overturn the 2020 election, is suing Verizon and the Jan. 6 Select Committee to keep them away from his phone records.

The Jan. 6 committee "is unconstitutionally pursuing law enforcement rather than legislative ends," argues Eastman in a lawsuit filed on Tuesday in the D.C. District Court. "Congress's investigative powers are ancillary to its legislative authority and are limited to that extent."

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The lawsuit argues that the Jan. 6 committee's subpoena to Verizon is invalid for several reasons. First is the allegation that the Jan. 6 committee is attempting to perform a "law enforcement function, rather than genuine legislative activity."

The former Chapman University professor also alleges that the subpoena violates House rules, as well as his First and Fourth Amendment rights. Finally, Eastman argues that the subpoena "infringes attorney-client privilege."

Eastman's lawsuit hopes to have the court declare the subpoena invalid and issue a temporary restraining order that would stop Verizon from complying with Chairman Rep. Bennie Thompson's subpoena.

This is not the legal scholar's first attempt to push back on the Jan. 6 committee's investigation. Eastman declined to answer the committee's subpoena against him, stating that he would plead the Fifth.

Eastman consulted the Trump administration on an assortment of legal matters. This included sending a memo to then-Vice President Mike Pence offering a plan that Pence could follow to throw out the election results on Jan. 6.

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The memo was later released by Bob Woodward and Carl Bernstein, drawing media attention to the legal scholar's purported strategy for overturning an election. Eastman later attempted to distance himself from the memo, claiming it was not a "viable option" and was a "crazy" idea.

Representatives for the Jan. 6 committee did not respond to requests for comment from the Washington Examiner.