The chairman of the Senate Judiciary Committee has invited special counsel Robert Mueller III to testify before the panel about his conversations with U.S. Attorney General William Barr.

Sen. Lindsey Graham, R-South Carolina, wrote to Mueller on Friday to invite him to clear up whether Barr misrepresented the substance of his March 27 phone call with the special counsel. Barr, in testimony this week before the Senate, told lawmakers that the conversation centered around Mueller's request for the prompt release of the summaries of his findings. The attorney general disputed claims that Mueller was frustrated by Barr's rollout of the findings.

But a March 27 letter Mueller addressed to Barr, which was made public this week, revealed the special counsel's apparent frustration with public confusion around his findings. Mueller's letter said the attorney general's four-page memo on his findings “did not fully capture the context, nature, and substance of this office's work and conclusions.”

Graham asked Mueller on Friday to “inform the Committee if you would like to provide testimony regarding any misrepresentation by the Attorney General of the substance of that phone call.”

Graham's full letter is posted below: