The top candidates in California’s gubernatorial race will face off twice this week, starting Tuesday night, as the contest to replace term-limited Gov. Gavin Newsom (D-CA) enters a tightly packed phase.

Tuesday’s televised debate on CNN comes just one day after voters began receiving mail-in ballots for the June 2 primary election, raising the stakes for a field in which five of the eight candidates are clustered within striking distance of one another. With early voting underway, the window to break out is shrinking rapidly.