Somewhere between 750,000 and 1.6 million Californians will abruptly lose federal unemployment benefits at the end of December, unless Congress passes and the president signs a bill extending them, according to two reports issued this week. An analysis released Thursday by the California Policy Lab estimates that 750,000 Californians will no longer receive benefits when two programs created under the federal Cares Act expire Dec. 26. The policy lab estimates that 583,000 people, or 40% of those receiving PUA in October, will lose it at year's end. The other 60% will have found work or exited the program for other reasons before then, said Till von Wachter, faculty director at the California Policy Lab, a research center housed at UC Berkeley and UCLA.