 Crooks wasn't on the FBI's radar, and he was believed to have acted alone. Investigators combed through his social media accounts but found no immediate threatening writing or posts or communications indicating an ideological motive. Crooks' political leanings also weren't clear. Records show him registered as a Republican voter in Pennsylvania, but campaign finance reports also show he gave $15 to a progressive political action committee on January 20, 2021, the day Biden was sworn in.