Sources say that President Trump's daughter-in-law is at a Manhattan hospital as a precaution after a suspicious letter containing an unidentified substance was sent to her apartment.
The letter was addressed to Vanessa Trump's husband, Donald Trump Jr.
NBC News says the letter was opened this morning and three people were taken to the hospital as a precaution.
Officials don't believe the substance is hazardous but are conducting a thorough probe.
Stay with us for updates.