When you read articles like this it makes it that much more clear that Trump and his administration do not understand much about anything. Take this for example, they clearly have little comprehension of business and market forces. Their goal is to keep investment from the Auto sector in the US and thus, apparently, create jobs for Americans. Here's the thing, if 85% of vehicle content must be from NA, and 50% from US, the cost of American made cars will skyrocket. The US cannot manufacture as cheap as Canada and Mexico (lower wages and currency), and North America cannot manufacture at the cost of China, India, Malayasia, etc.

 American auto manufacturers' COGS will increase and competitiveness with Japanese and European will decrease. The already struggling North American automaker (GM, Ford, Chrysler) will have to  have have to accept reduced margins (at same price point), or increase prices and have less price competitive products. Either way, they'll have less to invest.