Sen. Richard Blumenthal (D-Conn.) said late Wednesday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE could still be indicted in 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, despite claims by Trump's lawyer, Rudy Giuliani.

"The president is not above the law, and an indictment — if that's the course that Robert Mueller chooses to go — I believe would be upheld by the courts," Blumenthal told CNN.

Giuliani said earlier Wednesday that Mueller’s team has told Trump that it can’t indict a sitting president.

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“They can’t indict. At least they acknowledged that to us after some battling. They acknowledged that to us,” Giuliani said.

The former mayor of New York City joined the president's legal team last month to lead his representation in the Justice Department investigation into Russian interference in the 2016 election and possible collusion between Trump's campaign and Moscow.

Blumenthal, who was attorney general of Connecticut before becoming a senator, told CNN’s Wolf Blitzer that a case involving a presidential indictment could go up to the Supreme Court.

"It's an issue that has never been resolved, and that way there is a Department of Justice opinion to the contrary," Blumenthal said. "I happen to think that he could be indicted even if the trial is postponed.”

Thursday marks the one-year anniversary of Mueller's investigation, which resulted from Trump's decision to fire then-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.

Giuliani has said he intends to use the anniversary of the investigation to push for its conclusion.