Following on from my opening comment, Trump depends for support on (a) many people in all social classes that believe that he will upend the status quo to their advantage, & (b) wealthy supporters that believe that Trump is the key to lowering their taxation & freeing them from regulatory restraints. 

Group (b) includes many that will strongly caution against unilateral Trump action & group (a) includes many in industries that such action would negatively impact. In short, group (b) Trump support would hemorrhage from the get-go & group (a) Trump support might be initially strong but would also slide as months follow.

Surely Trump & his senior advisors are fully aware of the foregoing & Trump's bluster is therefore bluff (& rather ineffective at that).