The FBI disclosed that Thomas Crooks, 20, attempted to assassinate Donald Trump at a July rally in Pennsylvania after extensive research on both Trump and Biden. Nearly 1,000 interviews were conducted, but Crooks' motive remains unclear. Authorities highlighted his mixed ideologies and focus on opportunistic targets. An FBI official said that the suspected shooter exhibited a mix of ideologies and did not align strictly with either right-leaning or left-leaning views.