Omaha: Billionaire investor Warren Buffett said he’ll do whatever it takes to defeat Donald Trump including escorting people to the polls himself.

Campaigning with Hillary Clinton in Nebraska on Monday, Buffett savaged Trump’s business record, questioning his bankruptcies and asking why the Republican presidential candidate won’t release his tax returns. The ‘Oracle of Omaha’ then announced a new campaign called ‘Drive 2 Vote’, designed to bring out voters in Nebraska’s second congressional district, which offers a single Electoral College vote to the district winner. “I will take at least 10 people to the polls who would otherwise have difficulty getting there, said Buffett, adding that he had reserved a 32-seat trolley for the day with a goal of getting the highest-percentage turnout of any congressional district in the country. Let’s give America a civics lesson.”

The ‘Oracle of Omaha’ then announced a new campaign called ‘Drive 2 Vote’, designed to bring out voters in Nebraska’s second congressional district and ensure votes for the Democrat candidate Hillary Clinton.

Nebraska is one of two states that assign some electoral votes based on the results within congressional districts. While the state is Republican overall, President Barack Obama won a vote here in 2008 in the more liberal district where Clinton appeared Monday, which includes Omaha and the suburbs. The boundaries have since been redrawn to make the district less blue.

Buffett, who endorsed Clinton last year, was the latest in a series of business leaders attacking Trump as Clinton seeks to woo moderate and independent voters. Before several thousand people gathered at an Omaha high school, Buffett challenged Trump to agree to a meeting where they would both release their tax returns.