After spending hundreds of millions of dollars promoting conservative ideals, petrochemical tycoon Charles Koch said he regrets how he contributed to what he sees as deeper divisions in the United States.

Speaking to the Wall Street Journal about his latest book, Koch made it clear that he has not given up on his vision of a libertarian country. But building on his approach of changing “hearts and minds,” the 85-year-old Kansas billionaire suggested an approach that focused less on building up the next Tea Party and more on uniting “a diversity of people behind a common goal. That’s our approach today.”