Party official Graham Brady says he has received enough letters from lawmakers demanding a vote on Johnson's leadership to trigger one. That happens if 54 Tory lawmakers - 15% of the party's group in the House of Commons - write to Brady. (June 6) Subscribe for more Breaking News: http://smarturl.it/AssociatedPress Website: https://apnews.com Twitter: https://twitter.com/AP Facebook: https://facebook.com/APNews Instagram: https://www.instagram.com/APNews/ ​ You can license this story through AP Archive: http://www.aparchive.com/metadata/youtube/5157a19f92f24edc9e36d63058862d78