Related Clues:

• 'When hell freezes over'
• Under no conditions
• Rebel yell
• Challenge to Congress
• Kill bills
• Decisive refusal
• Line-item item
• One of 37 cast by Bill Clinton
• Give a thumbs down to
• "The Twelfth of __"
• Nix, presidentially
• Refuse to approve
• Governor's turndown
• 'Keep dreaming!'
• ''Not on your life!''