The former US president is reviewing treatment options after the diagnosis.
The announcement comes after weeks of speculation.
Harris used the speech to appeal to Middle America and undecided voters in November’s election.
The Democratic nominee for vice president has made an unusual impact on voters in a short space of time.
“Here’s a 78-year-old billionaire who has not stopped whining about his problems since he rode down his golden escalator nine years ago.”
The outgoing president used his speech to set out a vision for what he’d like to happen after his presidency.
The former US president appeared to be bleeding from his ear as agents escorted him from the stage.
Spoiler: there were more shades of grey than perhaps were expected.
A member of staff discreetly slid packets of tissues onto the tables where some of the family members were sitting.
