Hazmat units respond after Donald Trump Jr. receives envelope with white powdery substance

Donald Trump Jr., son of former President Donald Trump, received a letter at his Florida home on Monday afternoon containing a white powdery substance, officials said. 

Trump Jr. received the letter at his home in Jupiter, Florida, and he personally opened it, two law enforcement sources confirmed to CBS News. Early results indicated the substance was "not deadly."

Trump Jr. saw the white powdery substance, put the letter down and called 911, the sources said.