As one US President leaves the Oval Office, another enters - and President Donald Trump did not hold back with his scathing assessment of his predecessor, President Joe Biden.

While a gracious handover of power has long been part of the American presidential tradition, President Trump, 78, is known for his blunt and outspoken manner, which he wielded in his 'dragon's breath' speech. And, it was clear this verbal onslaught took its toll on President Biden, and Vice President Kamala Harris, who both appeared visibly strained as President Trump raged on.