President Donald Trump took credit for warning about Osama bin Laden a year before the al-Qaeda leader perpetrated the 9/11 attacks, as he lauded US Navy Seals for putting a "bullet in his head" and dumping his corpse into the "dark abyss".

"History will never forget that it was the SEALs who stormed the compound (of) Osama bin Laden and put a bullet in his head,” Trump said in a speech at Norfolk, Virginia, on Sunday during a special celebration to mark the US Navy's 250th birthday.

Trump went on to add that one year before al-Qaeda terrorists attacked the World Trade Centre twin towers in September 2001, he had warned about bin Laden.

"Please remember I wrote about Osama bin Laden exactly one year before he blew up the World Trade Centre. And I said, ‘You got to watch Osama bin Laden'

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