Steve Bannon, left, said that Elon Musk has become a "national security issue."Former Trump adviser Steve Bannon seized an opportunity to air his grievances with Elon Musk amid the SpaceX founder’s blowup with President Donald Trump.In a Friday interview with NPR, Bannon was asked about prior comments that Trump should cancel all government contracts with Musk. The tech mogul’s companies, which include Tesla, SpaceX and artificial intelligence startup xAI, have been given billions in federal dollars over the years, according to The New York Times.“I think we have as a country a national security issue here,” Bannon said Friday, adding that Musk has a reportedly “