At a rally in Pennsylvania on Saturday evening, former President Donald Trump survived an assassination attempt when a man opened fire. An eyewitness, who was present just outside the event in Butler, detailed the events that unfolded just before the shooting took place, RadarOnline.com can reveal. According to the witness, shortly after Trump began speaking at the rally, he and others noticed a man armed with a rifle climbing onto a nearby roof. The witness informed BBC News that they tried to warn authorities about the armed individual, stating that they could “clearly see him with a rifle” …