WASHINGTON — The incoming chairman of the Senate Judiciary Committee said Wednesday that attorney general nominee William Barr has confidence in special counsel Robert Mueller and will let him complete his Russia investigation.

Sen. Lindsey Graham, R-S.C., said after meeting with Barr, who led the Justice Department under President George H.W. Bush, that Barr has a “high opinion” of Mueller. Barr was spending most of Wednesday on Capitol Hill, meeting senators on the committee before his confirmation hearing next week.

“He had absolutely no indication he was going to tell Bob Mueller what to do or how to do it,” Graham said.

President Donald Trump pushed out Attorney General Jeff Sessions in November and made Sessions’ chief of staff, Matthew Whitaker, the acting attorney general before nominating Barr in December.

Trump’s critics have expressed concern that Barr may try to curtail Mueller’s investigation, which Trump repeatedly has called a “hoax” and a “witch hunt.” Also, Barr wrote an unsolicited memo to the Justice Department last year critiquing Mueller’s investigation into whether the president had sought to obstruct justice by firing James Comey as FBI director.

Graham said Barr also told him about his longtime relationship with Mueller. Barr and Mueller worked together when Barr was Bush’s attorney general from 1991 to 1993 and Mueller oversaw the department’s criminal division.