Country mourns back-to-back mass shootings. At least 20 killed in El Paso, Texas and at least 9 killed in Dayton, Ohio over the weekend. Alleged Texas shooter could face federal charges. Federal authorities treating 21-year-old Patrick Crusius as domestic terrorist. Source

Blake Rajahn asked his mother to make him an orange shirt that says, “I will be your friend.” The Georgia boy plans to wear it on his first day of school today. After being bullied, he said he wanted his classmates to know they are not alone. Source

Patrick Crusius’ grandparents say he was living with them while he attended nearby Collin College, but moved out 6 weeks ago Source

Mr. Trump says he wants Washington to “come together” after two weekend mass shootings and says the media “has a big responsibility to life and safety” Source

Afton Williamson said she’s quitting the show because of sexual harassment and racial discrimination she experienced during the show’s first season Source

A look back at what we’ve been covering on “CBS This Morning.” Source

Studies by the agency indicate motivating only a quarter of active shooters had ever been diagnosed with mental illness, and most aren’t typically loners Source

The mass shootings in Texas and Ohio add to the country’s troubling statistics on gun violence. There have been at least 255 mass shootings this year that killed 273 people and injured more than a thousand others. NYPD deputy commissioner John Miller testified before Congress in 2016 about law enforcement support for new gun laws. He joined “CBS This Morning” to talk about law enforcement’s assessments of the recent massacres. Source

Many recent mass shootings have a troubling common element: the accused killers have left a blueprint for their alleged actions on social media. Jeff Pegues went inside the FBI’s efforts to prevent future attacks. Source

Officials say the nervousness displayed by Clauvino da Silva as he tried to leave the prison dressed as a woman gave him away. Source