Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J.), a 2020 White House hopeful, said on Sunday that's he’s “offended” that Republicans are shifting attention to fellow Democratic presidential candidate and 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 as 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 faces an impeachment inquiry.

“Joe Biden is a statesman. He is truly an honorable man,” Booker said Sunday on CNN’s “State of the Union.”

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“I will be standing firmly in defense of Joe Biden throughout this process because this can in no way besmirch his character, his honor and his incredible service to this country over decades,” Booker added.

Cory Booker on the false allegations Pres. Trump has made against Joe Biden: “I will be standing firmly in defense of Joe Biden throughout this process because this can in no way besmirch his character, his honor and his incredible service to this country over decades” #CNNSOTU pic.twitter.com/PCHNR0cFwU — CNN Politics (@CNNPolitics) September 29, 2019

A transcript of a call between Trump and Ukrainian President Volodymyr Zelensky shows Trump asking the foreign leader to investigate Biden and his son. No evidence has emerged to show wrongdoing by Joe Biden in his actions with Ukraine while his son Hunter Biden sat on a Ukrainian company's board.

A whistleblower complaint also accuses the Trump administration of placing transcripts of the call on a highly classified server.

“I am offended by the Republicans trying to shift the attention in this, in what is Trump’s scandal. This is a Trump scandal and potential violation of office,” Booker said on Sunday. "It should in no way effect the vice president in pursuit of the nomination.”

The 2020 Democrats are united in backing an impeachment inquiry.

Almost all House Democrats have also backed the inquiry.

--This report was updated at 10:40 a.m.