Trump's sister receives threatening letter: media

Donald Trump's sister, a federal appellate judge in Philadelphia, has received a threatening letter similar to one received by one of the Republican presidential frontrunner's sons, media reports said Monday. Philadelphia police said both the US Federal Bureau of Investigation and Secret Service were investigating, but would provide no details. NBC News said the letter sent to Maryanne Trump Barry, 78, in Philadelphia was similar to one received on Thursday by Eric Trump in New York.