On Tuesday, the justices will hear arguments on whether to revoke mifepristone's approval and curtail its availability because the FDA imposed strict safety limits on who could prescribe and distribute it when it gave its approval.
Last week, the judge heard arguments in a case that will decide the safety of mifepristone, one of the drugs in the two-pill regimen that has been used by 5.6 million women since 2000, according to the FDA.