Senate GOP Leader Mitch McConnell bluntly warned Republican senators in a private meeting not to sign on to a bill from Sen. Josh Hawley aimed at limiting corporate money bankrolling high-powered outside groups, telling them that many of them won their seats thanks to the powerful super PAC the Kentucky Republican has long controlled. According to multiple sources familiar with the Tuesday lunch meeting, McConnell warned GOP senators that they could face “incoming” from the “center-right” if they signed onto Hawley’s bill. He also read off a list of senators who won their races amid heavy financial support from the...