Sen. Utah Mitt Romney, who recently said he may refuse to support President Trump's re-election bid, tweeted Sunday that it would be "disturbing in the extreme" if the president appeals to his Ukrainian counterpart to investigate Joe Biden and his son, Hunter.
Romney said in a tweet on Sunday that it was "critical for facts to come out."
Trump called his talks with President Volodymyr Zelenskiy "absolutely fine and routine."
"Nothing was said to be wrong in any way, Trump said.
Trump is reportedly accused of pressuring Zelenskiy to work with his personal lawyer, Rudy Giuliani, to investigate Hunter Biden and use military aid as leverage
Trump refused to make inaccurate requests, but he pointed his fingers at Bidens and their relationship with Ukraine.
Democratic presidential hopeful son Hunter Biden had been investigated in connection with business interests.
Biden has previously said that the US contain $ 1
Biden told reporters in Iowa on Saturday that "Trump deserves to be investigated. He violates a basic norm for a president. You should ask him the question , why is he on the phone with a foreign leader trying to scare a foreign leader, if that's what happened. "
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He accused Trump of" doing this because he knows I will hit him like a drum and he uses abuses of power and all parts of the presidency to try do something to lubricate me. "
Trump accused Biden of dishonesty, claiming he never talked to his son about his business dealings with a Ukrainian energy company, despite Hunter Biden telling the New Yorker that they spoke "only once" about it.
Fox News & Edmund DeMarche, Ronn Blitzer, Nick Givas and the Associated Press contributed to this report