Sen. Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), a 2020 White House hopeful, said on Sunday that she hasn’t seen any reason why former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE’s son Hunter would need to testify as part of the impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, as Republicans have requested.

Klobuchar said on CNN's "State of the Union" that Trump and the Republicans want to focus on former Vice President Joe Biden and his son as a part of a “sham investigation that the president was trying to push.”

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“I have seen no reason why you would have Hunter Biden testify when from all the reports we’ve seen is that this is not a valid investigation,” she said. “It was something in which the president was messing around to try to get information against a political opponent.”

House Republicans said on Saturday that they want Hunter Biden to testify as part of the impeachment inquiry to ensure transparency.

Klobuchar noted on CNN that GOP House leaders have also indicated their interest in testimony from the whistleblower who sparked the impeachment inquiry, which she says is unnecessary.

“That is what all of this mounting evidence is showing, and that is why I would agree with [House Intelligence Committee Chairman] Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE [D-Calif.]. Why would you reveal the whistleblower when you’re supposed to have protections?” she asked.

Sen. Amy Klobuchar on potential whistleblower testimony: "I would agree with Adam Schiff. Why would you reveal the whistleblower when you are supposed to have protections ... for this whistleblower?" #CNNSOTU pic.twitter.com/BCqrAJq9wF — CNN Politics (@CNNPolitics) November 10, 2019

The whistleblower raised concerns about a call during which Trump pressured the Ukrainian president to investigate unfounded corruption allegations against the Bidens days after aid to Kiev was withheld by the Trump administration.

Trump has repeatedly said he did nothing wrong.