"Elon Musk is right. The Pentagon, with a budget of $886 billion, just failed its 7th audit in a row. It’s lost track of billions," Sanders wrote. "Last year, only 13 senators voted against the Military Industrial Complex and a defense budget full of waste and fraud. That must change."

The veteran Democratic Senator, from Vermont, tweeted criticism for the department on Sunday, claiming it had managed to ‘lose track of billions’