There were 373 mass shootings in the USA as of December 22 2016  (333 in 2015 and 275 in 2014 ) also 14 484 deaths and 29 653 injuries. http://www.gunviolencearchive.org/ 

So are we to assume that every time that there is a mass shooting Mr Trump is going to take action on guns and gun control or are we to assume he only acts when Muslim terrorists kill .
 
A 2014 study by University of North Carolina found, since the 9/11 attacks, Muslim-linked terrorism has claimed the lives of 37 Americans. In that same time period, more than 190,000 Americans were murdered http://www.thedailybeast.com/articles/2015/01/14/are-all-terrorists-muslims-it-s-not-even-close.html