Donald Trump said Sunday night that he "of course" used his nearly $1 billion claimed loss in 1995 to avoid paying federal income taxes.

"I understand it, the tax code, better than anybody that's run for president," Trump said at the second presidential debate in St. Louis.

Trump and Hillary Clinton clashed on how they would change the tax code for the wealthiest Americans, with Clinton attacking Trump for minimizing his tax burden and Trump claiming Clinton does not want reforms that would harm her wealthy supporters.