 This is a special report from ABC News Trump assassination attempt. I'm Dave Packer. Investigations continue this morning into the suspected shooter who appeared to target former President Trump at a rally in Pennsylvania Saturday. The shooter identified as 20-year-old Thomas Matthew Crooks. ABC's Aaron Koturski is in Butler, Pennsylvania with more on what officials are focusing on in the suspected shooter's background. They're looking for anything online that might give them a hint about motive. So far they believe he acted alone and that