President Trump has attacked allegations that his attorney-general discussed campaign issues with the Russian ambassador, as speculation mounts over collusion during last year's election.
The Russian embassy announced his resignation via Twitter, writing, "Ambassador S.Kislyak has concluded his assignment in Washington, DC".
Kislyak's successor has not been announced, although it is widely expected to be Anatoly Antonov, a deputy foreign minister and former deputy defense minister seen as a hardliner regarding the United States.
Speaking Friday from the Aspen Security Forum in Aspen, Colo., Director of National Intelligence Dan Coats also sought to cast doubt on the report.More news: More attacks likely in Southeast Asia after Marawi
More news: Danilo sets out Man City Champions League ambition
More news: Real Madrid's Danilo completes move to Man City
The intercepted communications purportedly reveal that the ambassador and Attorney General had discussed campaign-related matters, including issues important to Moscow, over the course of the Trump campaign. Foreign Ministry Spokeswoman Maria Zakharova said that a possible rotation of the position such as Russia's ambassador in Washington was routine work. But The Post later reported that Sessions, who served as a top foreign policy adviser to the Trump campaign, met with Kislyak at least twice past year.
Kislyak also served as Moscow's ambassador to North Atlantic Treaty Organisation and to Belgium and was Russia's deputy foreign minister from 2003-08.
The president said that if he had known Sessions would recuse himself from the Russian Federation investigation, he "would have picked someone else" for the attorney general job. Sessions was then Trump's chief advisor on foreign policy issues.
Franken said Sunday that he "absolutely" wants Sessions to appear before the Judiciary Committee again, adding, "I think Chairman Grassley does want him to come back".