Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (D-Calif.) on Monday called for Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE to appear in front of the Senate Judiciary Committee following a report last week suggesting Sessions discussed campaign issues with Russia’s former ambassador to the United States.

In a letter to Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGardner signals support for taking up Supreme Court nominee this year Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee McConnell digs in on vow to fill Ginsburg's Supreme Court seat MORE (R-Iowa), chairman of the Judiciary Committee, Feinstein asked the chairman to invite Sessions to testify about alleged conversations he had with Ambassador Sergey Kislyak during the 2016 campaign.

“This is a serious matter, and the Judiciary Committee must hear directly from the Attorney General,” Feinstein wrote.

“As the head of the Justice Department, he holds a unique position of trust within our government, is charged with defending the Constitution, and serves as the nation’s chief law enforcement officer. It would be a grave breach of trust if the Attorney General gave false or misleading testimony to this Committee.”

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Feinstein’s letter comes several days after a report in The Washington Post said U.S. intelligence intercepted Kislyak’s communications with his superiors, showing that the ambassador said he and Sessions discussed matters related to the campaign. Kislyak and Sessions at the time talked about Trump's views on issues related to Russia and U.S.-Russia relations in a potential Trump administration, according to the report.

Fenstein, who serves as the Judiciary Committee’s ranking member, said in the Monday letter that she has requested the intercepted intelligence communications from Kislyak’s conversations with his superiors.

“I know you agree that a critical element of such oversight is our ability to ask questions directly of the Attorney General,” Feinstein wrote.

“However, nearly six months have passed since Attorney General Sessions was confirmed, and despite repeated requests from me and other members, he has still not been invited to testify before the committee of primary jurisdiction.”

Feinstein asked that Sessions be invited to testify “at the first opportunity in August or September.”