1/ Homeland Security Secretary Kirstjen Nielsen resigned after meeting with Trump to plan “a way forward� at the U.S.-Mexico border. Nielsen’s resignation came two days after she traveled to the border with Trump, and three days after Trump withdrew his nomination of Ronald Vitiello to be the director of Immigration and Customs Enforcement, because he wanted to “go in a tougher direction.� In her resignation letter, Nielsen said it was the “right time for me to step aside.� She will be replaced by U.S. Customs and Border Protection Commissioner Kevin McAleenan, who will take over as acting DHS Secretary until Trump appoints a permanent replacement. (New York Times / Washington Post / ABC News / Associated Press / CNN / Politico / NBC News) / Axios)

2/ Nielsen reportedly resisted Trump’s pressure to reinstate large-scale family separation at the border since January. Nielsen told Trump that federal court orders prohibited the Department of Homeland Security from reinstating the policy. Trump reportedly wanted families separated even if they came through a legal port of entry and were legal asylum seekers. Trump also wanted families separated if they were apprehended within the U.S. McAleenan has not ruled out family separation as an option. Separately, Trump was reportedly “ranting and raving, saying border security was his issue� two weeks ago. He then ordered Nielsen and Secretary of State Mike Pompeo to shut down the port of El Paso the next day, Friday, March 22, at noon. Nielsen proposed an alternative plan that would slow down entries at legal ports, to which Trump responded: “I don’t care.� (NBC News / CNN)

3/ A federal judge blocked the Trump administration from requiring asylum ...