Sparks flew during a closely-watched federal appeals court hearing Monday afternoon — with a Barack Obama-appointed judge tearing into the Trump administration’s plans to mass-deport alleged members of the Venezuelan gang Tren de Aragua. Judge Patricia Millett, a member of the bench since 2013, dominated much of the questioning — grilling a Justice Department lawyer over due process concerns for the 260 purported illegal migrants shipped to a notorious El Salvador prison earlier this month under the 1798 Alien Enemies Act. “There were planeloads of people. There were no procedures in place to notify people,” Millett exclaimed at one point....