Former Trump chief of staff Mick Mulvaney on Trump's chances in Arizona

"Everybody's assuming because the uncounted votes are in Maricopa County, that those votes will go for Biden because it's a slightly blue county," Mick Mulvaney, former chief of staff to President Trump, told CNBC's "Squawk Box" Thursday morning. What they are missing, I think, is the unique way that Arizona is counting their ballots. It's a last in, last out system."