Bloomberg is the most viable candidate to beat Trump, says Bloomberg 2020 advisor
Former New York City Mayor Michel Bloomberg's presidential campaign is starting to heat up. While several of the Democratic candidates are running on a tax-the-rich platform, Bloomberg himself is a billionaire. Between Republican voters who may be disillusioned with President Trump and wealthy Democrats opposed to a wealth tax, finding voters to back the former mayor might be a challenge. Tim O'Brien, senior advisor for Michael Bloomberg's 2020 campaign, joins "Squawk Box" to discuss.