EXCLUSIVE — The National Institutes of Health is facing congressional scrutiny after two of its scientists were charged with allegedly smuggling vials of the infectious monkeypox virus and other biological samples into the United States, according to a copy of a letter shared exclusively with the Washington Examiner on Tuesday.

NIH researchers Vincent Munster and Claude Kwe, both foreign nationals, are accused of conspiring to sneak undeclared biological material into the U.S. and lying to federal law enforcement about its content.