Steve Bannon told Trump that the risk to his presidency wasn’t impeachment, but the 25th Amendment—the provision by which a majority of the Cabinet can vote to remove the president. When Bannon mentioned the 25th Amendment, Trump said, “What’s that?” According to a source, Bannon has told people he thinks Trump has only a 30 percent chance of making it the full term.
https://www.vanityfair.com/news/2017/10/donald-trump-is-unraveling-white-house-advisers
https://www.vanityfair.com/news/2017/10/donald-trump-is-unraveling-white-house-advisers