"...trade only constitutes 10% of the massive U.S. economy..."

When ?   In 1960, maybe.

Total trade accounted for 30% of U.S. GDP in 2013.

Trump is himself a Wall Street Billionaire that won't disclose what (if any) US taxes that he has paid so why would you think that he is going to spearhead any serious crackdown on corporate tax cheats ?