I don't understand why Canada isn't bringing services into the discussion.  The US keeps quoting a US trade deficit in terms of goods.  But on the service side the US has a large trade surplus with Canada.  I just looked up 2015 US published data that states the US has a $15B trade deficit for goods with Canada but has a $27B trade surplus for services for an overall surplus in the US's favour.  Can't Canada threaten to restrict US service providers if the US gives Canada a hard time on goods?  Why isn't the Canadian government making more noise about services?

https://ustr.gov/countries-regions/americas/canada