Mueller’s team is expected to interview a number of other current and former White House aides, including former press secretary Sean Spicer, current chief counsel Don McGahn and communications director Hope Hicks.

Mueller’s team is interested in a number of actions Trump took in office, including the abrupt firing of FBI Director James Comey, a misleading statement written on Air Force One about Donald Trump Jr.’s meeting with with a Kremlin-linked lawyer during the campaign, and meetings Trump held as president with Russians, including former ambassador Sergei Kislyak and Foreign Minister Sergey Lavrov.