KGO ABC World News Tonight With David Muir September 6, 2019 00:45:00
>> i'm not sure that's relevant, but i don't -- you know, i don't get wrong things like, you know, there is -- we should lock kids up in cages at the border. >> reporter: the early front-runner joking that he's already considering his running mate. >> have you asked michelle obama for advice? >> only to be my vice president. i'm only joking! michelle, i'm joking. >> reporter: now, biden is arguing that his gaffes are largely trivial, but he is also facing a lot of criticism for saying recently that, quote, the details are irrelevant, in terms of decision-making. david? >> mary bruce live in wa...
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