The House Judiciary Committee will subpoena former White House staff secretary Rob Porter, Politico reported on Monday.
Porter, who resigned from his position last year following allegations that he abused his two ex-wives, was a key witness in former special counsel Robert Mueller's probe into President Donald Trump and Russian election interference.
Porter, who was known to take contemporaneous notes, is among the most cited sources in the second volume of the Mueller report, which covers obstruction of justice as opposed to possible collusion between the Trump campaign and the Russians, according to CNN.
Porter's subpoena is the sixth issued to officials close to the president after the release of the Mueller report. The committee has been authorized to issue subpoenas to 17 individuals.
Former White House counsel Don McGahn has refused to comply with his subpoena because the White House said he has absolute immunity from testifying before Congress. The committee has filed a lawsuit to force him to testify in public.
The White House is also expected to block Porter from complying with the subpoena.
Two other officials have testified but did not answer many questions about events after the 2016 election at the instruction of the White House.
The subpoena to Porter comes as the committee is ratcheting up its obstruction probe, writing in recent filings to the court that impeachment is a possible outcome of the investigation as Democrats seek witness testimony and Mueller's grand-jury materials, Politico reported.
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