Washington (CNN) Bernie Sanders says America's wealthiest individuals and large corporations would face tax hikes if he's elected president.

The Vermont senator who's closed the gap on Hillary Clinton in the Democratic presidential race said Sunday he'd use that money to pay for infrastructure, job creation and college costs.

In an interview with CNN's Jake Tapper on "State of the Union," Sanders complained of oil subsidies, companies stashing revenue overseas to avoid taxes and billionaire investor Warren Buffett's secretary paying a higher tax rate than he does.

"Clearly, that has got to change," Sanders said.

He said the United States needs rules that would "dampen down the speculation on Wall Street," and that he'd like to break up Wall Street's biggest financial institutions.

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