Trump sparks health fears at 9/11 event as one side of face 'completely drops'

New fears over Donald Trump's health have surfaced after his latest public appearance with First Lady Melania Trump at a service marking 24 years since the horrific 9/11 attacks.

When the US president addressed a crowd of service members and families of victims at the Pentagon Memorial near Washington on Thursday, people on social media could not help but notice something unusual about his appearance.