Aside from all the xenophobia and misogyny...

...Trump's policies will be bad for the US (and consequently the world's) economy. Protectionism can create jobs in the protected sectors but because those goods will then be more expensive, consumers have less to spend on other items, which means job losses for those who produce those items, as well as poorer consumers. Protectionism is robbing Peter to pay Paul and then robbing Paul as well! The markets are already reacting badly.