This hour, host Meghna Chakrabarti talks to WBUR senior political reporter Anthony Brooks about Massachusetts Attorney General Maura Healey's announcement that her office is joining the lawsuit challenging President Trump's executive order on immigration and refugees. We also talk to Carmen Ortiz, former U.S. Attorney of Massachusetts on the firing of Acting Attorney General Sally Yeats. Then, Tyler Jacks, director of the Koch Institute for Integrative Cancer Research at MIT joins us to kick off WBUR's Cancer Series, looking at why this is a moment of great hope for cures and how Boston become a hub for cancer research. Finally, we speak to Boston College professor Heather Cox Richardson who wrote a viral Facebook post calling President Trump's executive order on travelers from seven predominantly Muslim countries a "shock event" that has the potential to create social, political and economic chaos that could permanently shake up the United States.