White House counsel Don McGahn and former Chief of Staff Reince Priebus have both retained counsel, which comes just days after news broke that special counsel Robert Muller and his team were seeking interviews with six key people close to the administration.

According to a report from Law360.com, both McGahn and Priebus have hired William Bruck of Quinn Emanuel Urquhart & Sullivan LLP.

The special counsel also wants to interview James Burnham, who serves as a deputy to McGahn, former press secretary Sean Spicer, interim Communications Director Hope Hicks, and Josh Raffel, who is an aide to Jared Kushner.

The Law360.com story says Mueller wants to question McGahn in particular about President Trump's abrupt firing of James Comey from his FBI post as director of the bureau in May, which set off a firestorm of criticism and speculation.

The special counsel's investigation has already impaneled a grand jury to aide the investigation, and the FBI has conducted a raid of the Virginia home of former Trump campaign manager Paul Manafort.

Trump and his closest aides in the White House have repeatedly denied that the campaign colluded in any way with Russia as the 2016 campaigns were unfolding.