Senile senior? Biden's election campaign disaster and a tantrum. Even in his own party, some are questioning whether Biden is the right choice for one of the toughest jobs in the world at his age.

A special investigator now officially labels him as a senile old man. Biden's attempt to convince the public of his suitability for the highest office in the state ends in a turbulent exchange of blows with journalists - and with further evidence that the oldest US president of all time actually mixes up a lot of things.