WASHINGTON -- The U.S. State Department is ramping up its scrutiny of all Chinese nationals currently in the United States on a visa, department spokeswoman Tammy Bruce announced on May 29.

The State Department has made several shifts to visa policies this week.

On May 27, the department confirmed Secretary of State Marco Rubio had issued an internal instruction for embassies around the world to immediately pause student visa interviews as it prepares new vetting guidance. The following day, Rubio confirmed the United States would begin revoking visas for Chinese students with ties to the Chinese Communist Party or who are studying in critical fields....