🇺🇲 The US Congress has launched an investigation into "inexcusable security failures" at Donald Trump's campaign rally in Pennsylvania, increasing pressure on the agency responsible for protecting presidents and presidential candidates.

Both Republicans and Democrats on Sunday called for an immediate investigation into the role played by the US Secret Service following what the FBI called an assassination attempt at the former president's rally in Pennsylvania on Saturday night.

At a news conference early Sunday morning, FBI Special Agent Kevin Rojek said "it was surprising" that the shooter was able to fire. "There will be a long investigation into what happened," he added.