Leading his first commemoration of the solemn 9/11 anniversary, US President Donald Trump said today that the living, breathing soul of America wept with grief for each of the nearly 3,000 lives that were lost on that day 16 years ago.<br/><br/>Addressing an audience at the Pentagon, one of three sites attacked on September 11, 2001, Trump used the anniversary to sternly warn terrorists that America cannot be intimidated. He said, those who try are destined to join a long list of vanquished enemies, who dared to test our mettle. Mr Trump and first lady Melania Trump observed a moment of silence at the White House today at the exact moment that a hijacked airplane was slammed into the World Trade Centre.