evidence: A graph circulating on social media that purports to show the reverse trajectory of a suspected Chinese spy balloon has raised questions as to why it wasn't shot down, since weather data shows it would have originated from mainland China. [...] A senior defense official told reporters that the Pentagon had "very high confidence" that it was a Chinese high-altitude balloon collecting information about sensitive sites within America, according to the Associated Press. Montana is home to one of America's three domestic nuclear missile silo fields. [...] In a letter to Austin, Republican senator for Montana Steve Daines said that the balloon's presence over Montana, which has a nuclear silo field at the Malmstrom Air Force Base, "creates significant concern" that U.S. nuclear missile fields "are the target of this intelligence gathering mission." In a tweet he said that the administration has "failed to protect our skies."