As several GOP candidates jockey for late bumps in national polls that might put them on the debate stage next week in Cleveland, the candidates who are certain to make the cut are preparing for the event and hoping to at least meet and hopefully exceed expectations. The Politico Caucus has some advice for one frontrunner, former Florida Gov. Jeb Bush, on how to deal with the candidate currently leading in the polls, businessman Donald Trump:

Insiders warn Jeb: Don’t engage …