A letter addressed to Donald Trump Jr. containing a suspicious white powder that sent his wife to the hospital Monday had an ominous message for the president’s son, officials say.

“You are an awful person. This is why people hate you. You are getting what you deserve. So shut the f— up,” read the hate mail, officials familiar with the matter told the New York Post.

The envelope containing the note was delivered Monday to the Upper East Side residence of Trump Jr.’s mother-in-law around 10 a.m., sources said.

Trump Jr.’s wife, Vanessa, opened the suspicious letter and discovered the note along with a powdery substance.

When she realized the substance could potentially be harmful, she rushed out of the room, placed the powder-filled letter in a plastic bag, and called 911.

She and two others in the residence were taken to the hospital out of caution.

Trump Jr. tweeted a thank you message to his followers after Monday’s incident, confirming that his wife and children are safe.

Thankful that Vanessa & my children are safe and unharmed after the incredibly scary situation that occurred this morning. Truly disgusting that certain individuals choose to express their opposing views with such disturbing behavior. — Donald Trump Jr. (@DonaldJTrumpJr) February 12, 2018

Trump Jr. also responded to left-wing Twitter users mocking Vanessa’s potentially dangerous encounter, calling their actions “disgusting.”

Officials with the NYPD confirmed that the substance was “determined to be non-hazardous” and believe it was cornstarch.