It all depends on how he does it. Greed in developed countries has led to a "freetrade" environment that sold many in their populations down the river with the cover of unrealistic promises of wholesale retraining. Freetrade with countries like China & others with  low levels of costly human rights, labor rights, wages & environmental law, is a foreseeable problem that needed a transitional approach to getting to freetrade if its benefits were to avoid a shock caused by competition in certain areas that would permanently downgrade the standard of living of many in middle class while disproportionately rewarding those with wealth & capital or those with certain skills suited to the change. Granted computer/robots will eliminate a lot of these job eventually, but by then the workforce will be a later generation educated to meet that change. So, if freetrade can be expanded with countries that have like levels of human rights, labor rights, wages & environmental protections it might work