Politico reports investigators for Special Counsel Robert Mueller interviewed former White House Chief of Staff Reince Priebus on Friday.
Priebus is seen as a key player in understanding the president's actions because he was present for many meetings, including discussions on firing [former FBI Director James] Comey and White House meetings with Russian officials. He also was privy to White House internal documents.
The former RNC chief also had private conversations with Comey and other law enforcement officials as chief of staff and was near the Oval Office when Trump allegedly asked Comey to go easy on [former National Security Advisor Michael] Flynn.
Priebus also played a key role on the presidential campaign and spent thousands of hours with Trump.
Preibus' lawyer says his client participated voluntarily and was happy to answer all questions. The Washington Post adds the interview took all day.
Mueller's team interviewed Priebus on Friday (Politico)