Two individuals familiar with the situation that the former deputy counsel to President Donald Trump has been subpoenaed in the federal criminal investigation into the January 6 attack on the US Capitol, reported CNN.

One of the sources said that Patrick Philbin was subpoenaed for testimony and documents. According to sources, Philbin worked in the White House counsel’s office under Pat Cipollone, who was also subpoenaed for papers and testimony.

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The CNN report also noted that Philbin did not immediately respond to a request for comment.

As with Cipollone’s and vice presidential aides Marc Short and Greg Jacob‘s recent grand jury testimony, executive privilege will play a role in the talks over Philbin’s grand jury testimony.

Philbin and Cipollone were both significant witnesses to Trump’s activities during his final days in office. According to a Senate Judiciary Committee investigation, Cipollone and Philbin opposed a proposal to substitute the attorney general with someone willing to investigate false charges of electoral fraud.

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According to the source, both Philbin and Cipollone indicated that if such a plot was carried out, they would quit.

Philbin has already spoken about the Capitol incident in a separate investigation: earlier this year, he testified before the House select committee probing the January 6 attack.

Cipollone testified before the House committee that on January 6, he was joined by a number of key Trump aides, including Philbin, in pressuring the former President to make a strong statement about the attack.

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According to CNN, Philbin was among a group of attorneys from the Trump White House or campaign who were still working for the former president and were now focusing on more specific tasks such as handling executive privilege discussions with the National Archives or communicating with potential ex-White House witnesses called to Capitol Hill.

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Pat Cipollone recently testified before the House Select Committee examining the violence at the US Capitol on January 6. Liz Cheney, vice chair, stated that his testimony “met our expectations.”

Donald Trump allegedly referred to Pat Cipollone as “the strong, silent type” for rebuffing congressional subpoenas, asking other White House officials not to participate, and arranging the White House defence against the then-impeachment president’s trial while remaining out of the spotlight.