Pressure is increasing on Joe Biden to consider dropping his bid for a second Presidential term. 

The sitting President and presumptive Democratic candidate remains committed to the race. 

It follows a poor debate performance last week, in which Biden lost his way on several occasions. 

US correspondent Richard Arnold told Mike Hosking that Biden apparently annoyed some Governors when he met with them yesterday. 

He says one asked Joe Biden about his health, to which he replied, 'I'm fine, it's just my brain.' 

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