Donald Trump Jr.’s wife was exposed to an unidentified white powder after opening a letter intended for her husband … TMZ has learned.

Law enforcement sources tell us Vanessa Trump was exposed to the substance Monday morning. The letter — which we’re told said something along the lines of Jr. being an awful person and getting what he deserves — was sent to her mother’s apartment in Midtown Manhattan.

We’re told Vanessa and 2 other people were taken to a hospital as a precaution. The substance itself was tested and NYPD says it’s non hazardous. The envelope was reportedly addressed to Trump Jr., although it went to his mother-in-law’s home.

We still don’t know who sent it, or if there was an actual letter. The Secret Service is also investigating the matter.

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