A federal judge on Monday blocked another effort by the Trump administration to keep international students from attending Harvard University, granting a second preliminary injunction in the case. The order from U.S. District Judge Allison Burroughs in Boston preserves the ability of foreign students to travel to the U.S. for study at Harvard while the case is decided. President Donald Trump has sought to cut off Harvard’s enrollment of foreign students as part of a pressure campaign seeking changes to governance and policies at the Ivy League school.