Warren Buffett just fact checked Donald Trump.

In a debate Sunday, Trump acknowledged using a nine-figure loss in 1995 to reduce tax obligations and sought to liken the move to strategies used by some of Democratic presidential nominee Hillary Clinton’s wealthy supporters, including Buffett. On Monday, the billionaire Berkshire Hathaway Inc. chairman released information from his personal taxes and challenged the Republican presidential candidate to do the same.

“He has not seen my income tax returns. But I am happy to give him the facts,” Buffett said in a statement. “I have paid federal income tax every year since 1944, when I was 13.”

Buffett has been clashing for months with Trump, who has refused to release his tax returns, citing an audit. At a campaign event for Clinton in Omaha, Nebraska, in August, the Berkshire chairman challenged the Republican candidate to meet him “any place, any time ” to swap returns and answer questions from the public.