Trump's quest to bring coal back is unlikely to be successful. Coal production in the US in 2016 was at a 38 year low. Sadly for coal miners, employment in the coal industry has, due to technological changes, been dropping much faster than coal production. 

https://www.eia.gov/todayinenergy/detail.php?id=29472

Natural gas, solar and wind are now cheaper routes to electricity than coal in much of the US.