Joe Biden is under fire with Donald Trump’s former White House advisor Sebastian Gorka branding the US President a “senile buffoon”.

It comes after Donald Trump claimed the 81-year-old has put the world “on the brink of World War Three”.

Joe Biden is under fire with Donald Trump’s former White House advisor Sebastian Gorka branding the US President a “senile buffoon”.It comes after Donald Trump claimed the 81-year-old has put the world “on the brink of World War Three”.{ai:summary}<p>Joe Biden faces criticism from Donald Trump's former advisor, who calls him a "senile buffoon." Trump accuses Biden of putting the world on the brink of World War Three. #politics</p>

WATCH: Joe Biden branded a 'senile buffoon' in scathing rant by ex-Trump adviser

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