Special counsel Robert Mueller and his investigative team reportedly interviewed former White House press secretary Sean Spicer on Monday, as the probe into Russian election interference continues.

The interview with President Trump's former top aide lasted most of the day, Politico reported Tuesday, citing multiple sources familiar with the meeting.

Spicer reportedly answered a range of questions surrounding the Trump presidency, including the firing of former FBI Director James Comey, who was leading the bureau's investigation into Russian meddling at the time.

Spicer declined Politico’s request for comment, and his attorney, Christopher Mead, did not respond to the paper’s multiple attempts to ask for comment on the matter.

Mueller appears to be checking off the names of aides who served at the top levels of President Trump's team as he presses forward with his investigation into Russian interference in the 2016 election.

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The reports follow a Politico report that Mueller and his team also interviewed Trump's former chief of staff Reince Priebus on Friday, signaling his investigation is picking up steam.

“Mr. Priebus was voluntarily interviewed by Special Counsel Mueller’s team today. He was happy to answer all of their questions," Priebus's lawyer William Burck told The Hill.

Mueller, as well as several congressional committees, are looking into the success and extent in which Russians meddled in last year's election and whether Trump campaign aides colluded with Kremlin officials.

Reports surfaced in September that Mueller was interested in talking to Spicer, Priebus and Hope Hicks, Trump’s trusted adviser and interim communications director.