The Hill offers this report, which begins: “House conservatives are ready to stop the Senate immigration bill in its tracks with a potent procedural weapon should the contentious measure win passage in the upper chamber. The trump card conservatives may hold is a constitutional rule that revenue-related bills must originate in the House. The Senate immigration measure requires that illegal immigrants pay back taxes before becoming citizens, opening the door to a House protest, dubbed a ‘blue slip’ for the color of its paper.”