In news from the campaign trail, Democratic presidential candidate Hillary Clinton has been endorsed by one of the leading figures of the Republican national security establishment: Brent Scowcroft, the national security adviser to George H.W. Bush. His endorsement of Hillary Clinton is the latest indication of the chaos within the Republican Party over the presumptive nomination of Donald Trump. Not all Republican operatives, however, share the discomfort. On Wednesday, Donald Rumsfeld, George W. Bush’s first defense secretary, told Fox News Wednesday he can’t imagine not voting for Donald Trump.