The Department of Justice gave Special Counsel Bob Mueller internal documents about how Attorney General Jeff Sessions penned a letter of resignation after Mueller's appointment last year, ABC News’ Mike Levine reports. The documents — which also include emails with White House officials about fired national security advisor, Michael Flynn — were handed over to Mueller before his team interviewed Sessions earlier this month.

Catch up: Trump's firing of FBI Director James Comey prompted the appointment of Mueller as special counsel. Trump blamed Sessions for Mueller's appointment after Sessions recused himself from the Russia investigation, prompting Sessions to submit his letter of resignation. Trump ultimately didn't accept that letter.