Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) hinted at further questioning of ex-FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE on Sunday after the attorney general released a summary of the key findings from special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation.

"Could not agree more. See you soon," Graham tweeted, sharing a tweet from Comey earlier in the day.

Could not agree more.



See you soon. https://t.co/KNGzyDizdq — Lindsey Graham (@LindseyGrahamSC) March 25, 2019

Comey had tweeted "so many questions" with an image of him in the forest after Attorney General William Barr sent a letter to Congress detailing the conclusions of Mueller's investigation into potential collusion between the Trump campaign and Russia.

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The letter said that Mueller did not find evidence that the Trump campaign conspired or coordinated with Russia to interfere in the 2016 presidential election.

The letter also said that Mueller and his team had not concluded one way or another whether Trump obstructed justice while president. But Barr added that he and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE had decided not to pursue an obstruction charge after reviewing the special counsel's findings.

When asked for clarification on Graham's tweet, his office pointed The Hill to a letter from Graham to Barr about investigating a Foreign Intelligence Surveillance Act (FISA) warrant obtained on Carter Page, a former foreign policy adviser on Trump's campaign.

Republicans have said the FISA warrant obtained on Page was an abuse of federal power and based on faulty evidence.

Among the evidence presented by the Justice Department for the warrant was a controversial dossier compiled in 2016 by former British intelligence agent Christopher Steele.

That dossier alleges ties between the Trump campaign and Russia, but has not been verified.

In applying for the surveillance warrant on Page, the Justice Department had failed to disclose to the court that the research had been paid for, in part, by Democrats.

The concerns over the FISA warrant are part of a larger effort by Republicans to argue that the Justice Department made partisan decisions during the 2016 election, potentially to influence it.

Sunday's conclusion that there was no collusion between Trump's campaign and Russia may reignite efforts from Graham and other Republicans to pursue investigations into that issue.

Comey testified in front of House Republicans in late 2018 and has met with several members of the Senate Judiciary Committee on issues relating to Russia.