Sen. Lindsay Graham (R-S.C.) wants to look into President Trump's potential business ties to Russia as part of a Senate investigation, according to a CNN report.

The GOP senator told CNN's Manu Raju that his interest was piqued by an answer that former Director of National Intelligence James Clapper gave during a Monday hearing in the Senate.

During the hearing, Graham asked Clapper if he had any concerns about Trump's business dealings with Russia. Clapper responded that he did not have them at the time when officials were compiling a report on Russian interference in the election.

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Graham then followed up, asking if Clapper had any "broader" concerns about Trump's connections to Russia. Clapper responded by saying "I can't comment on that," stating that it was the subject of an ongoing investigation.

Graham is the highest-ranking Republican in the Senate to express support for reviewing President Trump's business connections in Russia. He is the chairman of the Senate Judiciary's subcommittee on crime and terrorism.