Biden responds to GOP senator's impeachment warning

DES MOINES, Iowa — Former Vice President Joe BidenJoe BidenFighting a virus with the wrong tools Trump bucks business on Defense Production Act Overnight Health Care — Presented by PCMA — US coronavirus cases hit 100,000 | Trump signs T stimulus package | Trump employs defense powers to force GM to make ventilators | New concerns over virus testing MORE responded to Iowa Sen. Joni ErnstJoni Kay ErnstCampaigns pivot toward health awareness as races sidelined by coronavirus Politics and the pandemic — Republicans are rightly worried Ernst calls for public presidential campaign funds to go to masks, protective equipment MORE (R) on Sunday after she suggested he could be impeached if he wins the presidential election. 

“Why don’t you all show Joni Ernst just how smart you are by caucusing for me?” Biden joked to a room full of supporters, to loud applause.

“I promise if you stand with me, we will end Trump’s reign of hatred and division,” Biden said.

Biden was occasionally interrupted by protesters urging him to shun contributions from fossil fuel companies. The former vice president was speaking to a crowd of more than 1,000 supporters at a middle school in Des Moines, Iowa, one of the largest crowds his campaign has attracted to date.

His remarks came in response to comments Ernst made in an interview with Bloomberg, where she suggested that Biden could be impeached if elected for supposedly "turning a blind eye to Burisma because his son was on the board making over a million dollars a year.”

“I think this door of impeachable whatever has been opened,” Ernst told the news outlet. “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 senator previously suggested that the impeachment trial could be used to hurt Biden's chances in the Iowa caucuses on Monday.

John Bowden contributed to this report.