The January 6 House select committee subpoenaed Donald Trump for documents and his testimony. However, the former president has now sued to block the subpoena calling it invalid and unenforceable.

The House select committee, which believes Trump was the key instigator of the January 6 attack and also the “central player” in the effort to overturn the results of the 2020 election, could face hurdles in getting the 76-year-old to testify.

Trump’s lawyers claimed that they tried reaching out to the committee about answering written questions instead of a testimony. They also expressed “concerns and objections” about the bulk of the document requests.

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“The Subpoena’s request for testimony and documents from President Trump is an unwarranted intrusion upon the institution of the Presidency because there are other sources of the requested information, including the thousand-plus witnesses the Committee has contacted and one million documents that the Committee has collected,” his attorneys argued in the lawsuit filed in a federal court in Florida. “The Committee also may obtain abundant government records relevant to its inquiry. Because of this obvious availability to obtain testimony and documents from other readily available sources, the Subpoena is invalid.”

Trump’s lawyers argued in the lawsuit that any meeting with the House committee would violate privilege protections around the executive branch, including revealing conversations Trump had with Justice Department officials while he was president.

The former POTUS also said that it was not necessary for him to reveal about the inner workings of his 2020 presidential campaign, “including his political beliefs, strategy, and fundraising. President Trump did not check his constitutional rights at the Oval Office door. Because the Committee’s Subpoena to President Trump infringes upon his First Amendment rights it is invalid.”

Trump’s attorney, David Warrington, said in a statement, that “long-held precedent and practice maintain that separation of powers prohibits Congress from compelling a President to testify before it.”

Representative Liz Cheney, vice chair of the committee, said during an appearance at the University of Chicago Institute of Politics, that Trump has a “legal obligation” to respond to the panel’s subpoena.

“If he doesn’t — and he’s failed already to produce documents by the deadline — the committee will consider possible next steps,” Cheney said. “And separately, we’re also obviously considering, as part of the report, criminal referrals,” Cheney told the audience while talking about the committee’s ongoing work in completing a final report of its findings in the next month.

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Meanwhile, another concern for the January 6 panel would be if Republicans take control of the House following the midterm elections. This could lead to an an end of the investigation, throwing the court case without a resolution. Republicans would also likely withdraw the subpoenas.