On Sanders and Trade Agreements

Sanders believes that all of the trade agreements signed within recent memory were the product of a rigged political system dominated by plutocrats, and are largely responsible for wage stagnation.  On that point, he more or less agrees with Trump; unlike Trump, however, he hasn’t told us what he plans to do about it. Are his plans to strengthen the welfare state his answer?  Or does he plan to disregard the agreements and start imposing tariffs?  If the latter, what is he going to do to deal with the inevitable consequences:  rising prices and the loss of jobs in exporting industries due to retaliation?

We need to know the answer to these questions ASAP.