The lawmakers, all Democrats who urged military service members not to follow illegal orders, said prosecutors had contacted them. But it is unclear what crime they might have committed.
The bill would allow lawmakers to keep their existing stock and continue to sell it if they provide seven to 14 days of notice. Democrats called it a "gift to insider traders."
A panel in Los Angeles sided with Gov. Gavin Newsom in a decision that will help Democrats counter Republican gerrymandering in Texas. Republicans are expected to appeal.
The former congresswoman is the latest top-tier recruit for Democrats, who face a difficult Senate map this year as they try to retake control of the chamber.