Earlier this year, Harvard scientist Kseniia Petrova landed at Boston Logan Airport with samples of frog embryos in her luggage. Those samples cost Petrova her visa and kickstarted an asylum claim that landed her in an ICE detention facility in Louisiana. WSJ’s Michelle Hackman explains that Petrova’s case represents an aggressive shift in the Trump administration’s stance towards immigrants with visas. Jessica Mendoza hosts. Further Listening: -Trump 2.0: Trade Wars and Deportation Battles -A New Phase in Trump’s Immigration Fight Sign up for WSJ’s free What’s News newsletter . Learn more about your ad choices. Visit megaphone.fm/adchoices