Homeland Security Secretary Kirstjen Nielsen resigns, what’s next for immigration policy?

President Donald J. Trump, joined by Vice President Mike Pence, watches as Department of Homeland Security Secretary Kirstjen Nielsen swears in naturalization candidates on January 19, 2019, in the Oval Office. Credit: Official White House Photo by Joyce N. Boghosian

More top officials at the Department of Homeland Security will reportedly be out just one day after Secretary Kirstjen Nielsen resigned. Nielsen became the public face of the administration’s child separation policy last year, even though she was reported to be more ambivalent about it than other administration officials. After announcing Nielsen’s resignation Sunday, President Trump tweeted “our country is FULL!” The president also tweeted that the commissioner of U.S. Customs and Border Protection Kevin McAleenan will be stepping in as acting secretary. But that announcement raises some legal questions.