According to reports, former-Vice President Mike Pence will challenge the special counsel's subpoena by invoking the "Speech or Debate" Clause. Politico cites an unnamed source:
Pence allies say he is covered by the constitutional provision that protects congressional officials from legal proceedings related to their work — language known as the "speech or debate" clause. The clause, Pence allies say, legally binds federal prosecutors from compelling Pence to testify about the central components of Smith's investigation. If Pence testifies, they say, it could jeopardize the separation of powers that the Constitution seeks to safeguard.
"He thinks that the 'speech or debate' clause is a core protection for Article I, for the legislature," said one of the two people familiar with Pence's thinking, who spoke on condition of anonymity to discuss his legal strategy. "He feels it really goes to the heart of some separation of powers issues. He feels duty-bound to maintain that protection, even if it means litigating it."
The Speech or Debate Clause appears in Article I, Section 6, along with several other provisions:
