Trump said "of course" he took advantage of a loophole to avoid paying federal income taxes, potentially for many years.

"I absolutely used it, and so did Warren Buffett, and so did George Soros and so did many people who Hillary is getting money from."

Trump said he understands the complex U.S. tax system better than anybody else.

Trump wouldn't reveal the exact number of years he avoided paying federal income taxes, saying only that he does pay federal taxes.