By “determined on the front end” he means any illegal who checks a box gets to vote and it’s never verified or validated by anyone ever. California has the largest population of illegals in the USA and it allows any of them who wish to self-certify and vote in federal elections.
I asked U.S. Senator Alex Padilla and former CA Secretary of State if California has the ability to verify if non-citizens are on the voter rolls.
He explained it's "determined on the front end, when people register to vote."
He's worried about timing of U.S. DOJ's action now: