Texas Gov. Greg Abbott (R) backed out of a scheduled appearance at the National Rifle Association (NRA) convention taking place in Houston on Friday, following the tragic mass shooting at an elementary school in Uvalde, Texas, that took the lives of 19 children and two adults on Tuesday. Instead, Abbott will hold a press conference in Uvalde at 3:30 p.m. and send in a video recording to the convention. Abbott has been an advocate for gun rights in Texas and has drawn strong backlash since the shooting. The shooter, 18-year-old Salvador Ramos, legally bought the two guns and ammunition he used …