https://www.vanityfair.com/news/2017/10/donald-trump-is-unraveling-white-house-advisers
"Even before Corker’s remarks, some West Wing advisers were worried that Trump’s behavior could cause the Cabinet to take extraordinary Constitutional measures to remove him from office. Several months ago, according to two sources with knowledge of the conversation, former chief strategist 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."
