Donald Trump has been condemned as a “vile, disgusting man” and a “sick human being” after gloating over the death of Robert Mueller, a former director of the Federal Bureau of Investigation (FBI).

Mueller, a decorated Vietnam war veteran who led a politically explosive investigation into Trump, died on Friday aged 81, triggering a callous reaction from the US president.

"Good, I'm Glad": Trump Condemned For 'Disgusting Reaction' to Ex-FBI Chief's Death

Mueller’s health concerns first came to light in 2019, at the time he was 74, when he gave a shaky testimony before the House Judiciary Committee.

Ex-FBI director Robert Mueller, who investigated Trump on ‘Russiagate’, diagnosed with Parkinson’s – Who is he?

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"Good, I'm Glad": Trump Condemned For 'Disgusting Reaction' to Ex-FBI Chief's Death

Ex-FBI director Mueller, who investigated Trump, diagnosed with Parkinson’s