I know for Trumps comments that he thinks that other countries should import more from the US.  However if anyone was a loser in NAFTA it is Canada and Mexico.

The US is the largest consumer economy and also has more people than either Mexico or Canada.  If you look at the trade between us and the US we in Canada import almost $9000 USD per capita in Goods and Services a year from the US (2016), the US imported from US $ 930 USD per capita.

Mexico imported $ 2000 USD per capita vs the US importing $ 980 USD per capita from Mexico.