people, of all americans. >> our constitutional right to abortion is at the greatest risk it's ever been. >> reporter: both sides are closely watching a case that centers around a mississippi law that bana aortions after 15 weeks, a direct challenge to the now-49-year-old "roe v. wade" decision, which said states cannot ban abortion before fetal viability, typically around 24 weeks. a ruling is expected this summer, but a growing number of conservative states are already passing new restrictions, while more liberal states try to enact protections. >> essentially, what it's saying is that, you know, abortion access depends on where you live. >> tracy: natalie, we're expecting more demonstrations in washington tomorrow. what's that all about? >> reporter: that, ben, would be a rally again vaccine mandates. thousands are expected tomorrow on the national mall. among the expected speakers, robert kennedy jr., and this