Seven leading contenders in California's gubernatorial race participated in a televised debate Tuesday night as voters began casting ballots in the state's nonpartisan primary election.

The CNN-hosted debate took place as millions of California voters received their mail-in ballots ahead of the June 2 primary. The contest to succeed outgoing Democratic Governor Gavin Newsom has attracted candidates from both major parties in what observers describe as an increasingly competitive race.

The gubernatorial field was reshaped in recent weeks following the withdrawal of former Democratic Congressman Eric Swalwell, who had been considered among the leading candidates. Swalwell exited the race amid sexual assault and harassment allegations, which he has denied.

With early voting now underway, lower-polling candidates face limited time to gain momentum before the primary. California's nonpartisan primary system allows the top two vote-getters, regardless of party affiliation, to advance to the November general election.

The debate provided candidates an opportunity to distinguish themselves before voters as the campaign enters its final weeks before the primary deadline.