Donald Trump, another free trade critic in the 2016 presidential race, has vowed to violate the North American Free Trade Agreement and World Trade Organization treaties by imposing tariffs that clearly violate the deals. Sanders, by contrast, has more respect for the conventions of international law. He told the paper that he would maintain the existing deals as he sought to replace them.

"They should be renegotiated," Sanders told the Inquirer. "We have an agreement, legally we have agreement. But they should be renegotiated."