Trump’s tweet came before the trial of ex-campaign chief Paul Manafort entered its second day in federal court in Virginia. Manafort is being tried by Mueller’s team.
Sessions, who endorsed Trump’s presidential bid during the 2016 campaign, recused himself from the Russia investigation last March, before Mueller was appointed. The investigation is being overseen by Deputy Attorney General Rod Rosenstein, who has defended Mueller against critics in Congress.
Trump has attacked Sessions several times for his recusal. In June, the president wrote in a post on Twitter that Mueller was continuing to investigate “all because Jeff Sessions didn’t tell me he was going to recuse himself.