Washington: The Senate Intelligence Committee has subpoenaed documents from Michael Flynn, President Donald Trump’s fired national security adviser, in a sign the bipartisan probe will continue full speed ahead one day after Trump terminated Federal Bureau of Investigation (FBI) director James Comey.

Chairman Richard Burr, the North Carolina Republican, and top Democrat Mark Warner of Virginia announced they had issued the subpoena—a rare move for the panel—late Wednesday, saying Flynn had refused to comply via his lawyer with a 28 April request for documents in the investigation of Russian interference in last year’s election.

Flynn has previously sought immunity, a request backed by Trump in a tweet. That request hasn’t been granted.

“Mike Flynn should ask for immunity in that this is a witch hunt (excuse for big election loss), by media & Dems, of historic proportion!" Trump tweeted 31 March.

Flynn was fired for misleading vice president Mike Pence about the nature of his conversations with Russian Ambassador Sergey Kislyak, who was among the Russian diplomats who met today with Trump at the White House.

Burr has said he was troubled by the Comey firing but would continue to press ahead with his investigation wherever it leads. He and Warner have invited Comey to testify before the committee on 16 May in a closed session.

The committee had announced it was prepared to use subpoena power when it first began the bipartisan probe in January. It may not be the last one to be issued.

“I’ve said from the beginning that our intentions are to get information from all the individuals of interest, and I will go to whatever lengths I feel necessary," Burr said in a brief hallway interview at the Capitol, hours before Trump fired Comey Tuesday. Bloomberg