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

The probe comes just hours after the president, in a series of posts on Truth Social, baselessly accused Democrats of “rigging” Tuesday’s primary as results slowly trickle in — a process that in past cycles has taken several days in a state with 23 million registered voters and widespread mail-in voting.

“There’s BIG cheating by the Dumocrats in California. Votes are all tied up. May not be in for weeks. Under investigation by the U.S. Attorney’s Office in Los Angeles. Why the vote counting DELAY???,” Trump wrote in a flurry of posts early Thursday morning.

California state election officials have long warned that the ballot counting process could take several days. Contests for the high-stakes gubernatorial race and Los Angeles mayoral race, among others, remain unresolved.