Even as school administrators and Democratic leaders repeat their promise to shield students and teachers from U.S. Immigration and Customs Enforcement agents, they appear unsure exactly how far to go to prevent federal agents from making arrests on campus.

President Donald Trump seems to have finally found a country that won’t rebuff his plan to send it hordes of undocumented immigrants who don’t hail from that nation. The Trump administration is working on a plan with El Salvador that would allow the Latin American country to accept immigrants from the U.