Two days after Donald Trump’s son received a powder-filled letter, authorities confirmed that the candidate’s sister, federal appeals court judge Maryanne Trump Barry, received a similar letter. The letter sent to Eric Trump reportedly said that the front-runner’s family would be harmed if he didn’t drop out of the race. Early tests suggest the powdery substance was non-toxic. A source tells NBC Philadelphia that the letter to Trump Barry contains a similar message, but no powder. It’s unclear if the two letters were sent by the same person. The FBI said it’s "aware of the incident and is working closely with the United States Secret Service and U.S. Marshals Service."