Who will have the power at a brokered GOP convention? (Elaine Kamarck, Brookings)

What should the Republican Party do about Trump? That is the question on the minds of many as we go into the final round of primaries and caucuses—a round in which Trump could get the most votes, the most delegates, and perhaps even lock up the nomination. But in the past few weeks the anti-Trump forces have been getting their act together—somewhat belatedly—and the political class is salivating over the fact that there could be a brokered convention for the first time in more than half a century. How would that happen? And who are the brokers?

http://www.brookings.edu/blogs/fixgov/posts/2016/03/21-gop-governors-have-the-power-at-a-brokered-convention-kamarck