The US presidential election is proving a boon for bookmakers, with estimates that more than $1 billion has already been bet on the winner around the world even before polling day.

Jeb Bush has some advice for his onetime rival President Donald Trump: "Stop saying things that aren't true."

Ex-presidential hopeful Jeb Bush made an appearance as a limo driver on Sunday in the opening joke of the Emmy Awards, asking host Jimmy Kimmel what it's like to be nominated.