A DAY after Vanessa Trump was taken to hospital after opening an envelop with white powder inside that was addressed to her husband, Donald Trump Jr, it has been revealed what the enclosed letter said.

“You’re an awful person and now you get what you deserve,” according to law enforcement sources told the New York Post this morning.

The note was delivered to the Upper East Side home of Trump Jr.’s mother-in-law around 10am on Monday (2am AEDT Tuesday), sources have said.

Vanessa Trump, opened the letter and discovered the powdery substance and note, sources said.

Realising the potential danger, a panicked Mrs Trump then ran out of the room and stashed the letter and powder in a plastic bag and called 911, sources said.

She was rushed to the hospital as a precaution.

The substance turned out to be cornstarch.