Mike Gravel is a former senator from Alaska who ran for president this year – twice – once as a Democrat and once as a Libertarian.
In his campaigns, he has criticised the military-industrial complex that shapes US policy and fought for "direct democracy" – allowing ballot initiatives at the federal level so people can decide laws without Congress.
Gravel is a leading critic of the Iraq war and all pre-emptive wars, including war with Iran. He joins Riz on Wednesday.
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This episode of Riz Khan airs on Wednesday, September 17, 2008, watch live at 2030GMT, with repeats at 0030GMT and 0530GMT.