On September 15, citing two senior US government officials, the Washington Post reported on September 13 that an internal investigation by the US Secret Service revealed serious irregularities in the Secret Service's own work during the attempted assassination of former US President Trump.

According to the report, Secret Service personnel initially planned to install a significant amount of equipment and flags between the rooftop where the shooter was located and the venue where Trump was speaking, in order to block the line of sight. However, this requirement was not implemented. The report points out that the intelligence transmission system also had serious flaws. The radio room, which should have been receiving real-time alerts from patrolling police officers, was unable to receive the signals. (Jin Shi)