Former Sen. Jeff Flake announced on "CBS This Morning" on Tuesday he will not run for president in 2020 against President Trump.

Details: “I have always said that I do hope that there is a Republican who challenges the president in the primary. I still hope that somebody does, but that somebody won't be me. I will not be a candidate,” Flake said. The former Arizona senator will join CBS News as a contributor in a new series called "Common Ground."