Iowa Senator Joni Ernst warned Sunday that Republicans could immediately push to impeach Joe Biden over his work in Ukraine as vice president if he win the White House.

“I think this door of impeachable whatever has been opened,” Ernst said in an interview with Bloomberg News. “Joe Biden should be very careful what he’s asking for because, you know, we can have a situation where if it should ever be President Biden, that immediately, people, right the day after he would be elected would be saying, ‘Well, we’re going to impeach him.’”

The grounds for impeachment, the first-term Republican said, would be “for being assigned to take on Ukrainian corruption yet turning a blind eye to Burisma because his son was on the board making over a million dollars a year.”

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President Barack Obama sent Biden to Ukraine on his behalf to fight corruption, including leading the push from the U.S. and western European powers to remove prosecutor general Viktor Shokin from office. When Shokin was fired in 2016, no congressional Republicans expressed concern about the move. Eventually, though, Shokin began to argue that he was fired because he was investigating Burisma and Biden wanted to protect his son, Hunter, who was on the company’s board. The claim has been debunked.

Biden told a Sinclair news reporter in Iowa that her words reinforced his argument that Trump’s interest in Ukraine was meant to damage his candidacy.

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