Authorities say Crusius drove more than 10 hours from his hometown near Dallas to carry out the shooting in the largely Latino border city of El Paso. An attorney for the Crusius family, Chris Ayres, told The Associated Press that the rest of the family never heard Patrick Crusius use the kind of racist and anti-immigrant language that was posted in the online screed.
Crusius has been charged with capital murder and is being held without bond. Federal prosecutors have said they are also considering hate-crime charges.
The attack came hours before another mass shooting in Dayton, Ohio, in which nine people were killed. The dual shootings, which killed 31 people in all and wounded dozens more, reignited calls for Congress to take immediate action to reduce gun violence.
Trump said on Friday that he believes he has influence to rally Republicans around stronger federal background check laws. But at the same time, Trump said he had assured the National Rifle Association that its gun rights views would be “fully represented and respected.”