The top two candidates in this primary will advance to the general election in November, regardless of party affiliation. Most Californians vote by mail, and ballots postmarked on or before Election Day have one week to arrive.

Election law expert Hans von Spakovsky says California's slow vote counting stems from mass mail voting, a seven-day ballot window, and cure periods.

The probe was announced just hours after President Donald Trump baselessly accused Democrats of “rigging” Tuesday's primary election.

Mail-in ballots and security measures contribute to counting delays in California's close contests, an election expert says, and last-minute voters in the governor's race may slow things down further.

In the race for L.A. County sheriff, incumbent Robert Luna was leading with 44.7% of the vote over the man he defeated four years ago, Alex Villanueva, who had 23.1%, according to the latest returns from the June 2 primary.