Thomas Mathew Cooks, the gunman who attempted to assassinate the United States Republican presidential candidate, Donald Trump, searched online for events of the former president and President Joe Biden. Kevin Rojek, the special agent in charge of the FBI’s Pittsburgh field office, said Cooks repeatedly looked up information about explosives and saw the Pennsylvania campaign rally as a “target of opportunity.” Addressing reporters on Wednesday, Rojek said investigators who have conducted nearly 1,000 interviews do not have a motive for why the 20-year-old shot at Trump during a July 13 campaig…