Evan McMullin, a former CIA counterterrorism officer, will run for president as a third-party conservative alternative to Donald Trump, GOP operatives working to back the candidate told ABC News today. It's an extreme uphill climb, but his supporters are confident McMullin, 40, can act as a disruptor who they hope can peel off some red states in a race where some Republicans are still resistant to Donald Trump. McMullin’s candidacy, backed by some Republicans, shows how the “Never Trump” movement is still working to upend Trump even with less than three months left until the general election. McMullin may be a long shot, but will have a legitimate organization behind him. He resigned this morning as chief policy director of the House Republican Conference, and will file today.