Trying to parse the difference between polls and Trump's approval rating

[youtube https://www.youtube.com/watch?v=fXXyvsyNYzE?feature=oembed&w=500&h=281]
Steve Kornacki, the NBC News political correspondent, joins Smith to talk about how President Trump’s national approval rating does not align with his polling in battleground states, which could mean the race is a lot closer than individual state polls show.