Nielsen’s resignation as DHS secretary comes amid a surge of illegal immigration at the U.S.-Mexico border and an expanded Catch and Release policy that the Immigration and Customs Enforcement (ICE) agency has been tasked with carrying out. During Nielsen’s tenure as DHS secretary, illegal immigration has increased nearly every month over the last year and a half. Simultaneously, the Trump administration has yet to construct a border wall on new land at the southern border that did not previously have barriers built by the Bush and Obama administrations. Most recently, officials with the National ICE Council accused Nielsen of “grossly”...