Rooftop where gunman shot at Donald Trump during campaign rally ‘was identified as security risk’ [Video]

The rooftop where a gunman shot at Donald Trump during a weekend campaign rally was reportedly flagged as potentially vulnerable by the Secret Service in the run-up to the event.

The security agency was aware that the building next to the outdoor venue where the campaign was taking place in in Butler, Pennsylvania, posed a risk, according to NBC News.

“Someone should have been on the roof or securing the building so no one could get on the roof,” a former senior Secret Service agent said to be familiar with the planning told the US news outlet.

A local law enforcement officer climbed to the roof and found Crooks, who pointed the rifle at the officer.

The officer retreated down the ladder, and the gunman quickly fired towards Mr Trump, the officials said. That is when US Secret Service officers shot him dead.

Questions are being asked how the gunman …