It's nice to see it getting brought up, and as a campaign point in America no less. Knowing nothing else, he sounds like an alright candidate.
Kurzgesagt did videos on these topics, and while they don't directly relate, something will inevitably have to be done about the increasing amounts of unemployment that KZ suggest would make half of America's workforce redundant, and their explanation of UBi generally fits the bill. They suggest simply swapping over the administration fees of current benefit systems and using that for UBI, as there isn't as much overhead (i.e. All you need would be some form of ID and residency status, rather than taking into account your income, employment status, rent costs, disability, etc...) but obviously that would differ between countries (e.g. Finland almost works on this system already, by having tax rates at 50% for high earners).
Unfortunately, I doubt this guy is gonna get a shot at it. He directly targets hi-tech companies benefiting the most from automation, which if the Kurzgesagt video is anything to go by, will be most current mega-companies that have massive lobbying power in the US... you can already see where this is going. All the best to him for 2020.
There's also other concerns. The UK has been rolling out the Universal Credit scheme which is only supposed to combine payments into one, like a UBI would (it doesn't just give you free money though), and it has been slandered as a complete disaster which has increased suffering, suicides, and an increased use of food banks, simply because the system is automated and doesn't into account individuals needs very well if they have multiple problems that require financial support.
It has to be done correctly first time, or millions will suffer who already jump through hoops of current systems.