Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE on Tuesday called out Iowa Sen. Joni Ernst Joni Kay ErnstPoll shows tight Senate race in Iowa Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R) for suggesting that the former vice president would be hurt politically at next week's caucuses due to President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE's defense team focusing on him at the Senate impeachment trial.

“She spilled the beans,” Biden said at a campaign event in Muscatine, Iowa, a day after Ernst made her remarks about the Democratic presidential candidate while speaking to reporters at the Capitol.

“She just came out and flat said it. You know, the whole impeachment trial for Trump is just a political hit job to try to smear me, because he is scared to death to run against me, and he has good reason to be concerned," Biden added.

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The former vice president went on to argue that Democrats in Iowa have the chance to "ruin" Trump and Ernst's night by caucusing for him next Monday during the first-in-the-nation 2020 vote.

Trump's lawyers repeatedly targeted Biden and his son Hunter Biden during their opening arguments on Monday.

They made the case that Burisma, a Ukrainian gas company whose board included Hunter Biden, was corrupt and that the younger Biden's spot on the company's board while his father served as vice president represented a conflict of interest.

Trump's lawyers also argued that it was appropriate for the president to bring up the Bidens on his now-infamous July 25 phone call with Ukrainian President Volodymyr Zelensky, asserting that he was concerned with corruption.

The phone call is at the center of Trump's impeachment and allegations that Trump tied millions of dollars in military aid to Ukraine to the nation announcing probes into his political opponents, including the Bidens.

Democrats argue that Trump's dealings amount to abuse of power in pursuit of personal gain, while the White House has maintained that Trump did nothing wrong on the call.

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Ernst said Monday she was "really interested" to see how Trump's legal team's presentation on the Bidens would inform caucusgoers.

"Will they be supporting Vice President Biden at this point? Not sure about that," she said.