A small group of Democratic National Committee members has privately begun gauging support for a plan to potentially weaken Bernie Sanders’ presidential campaign and head off a brokered convention.

In conversations on the sidelines of a DNC executive committee meeting and in telephone calls and texts in recent days, about a half-dozen members have discussed the possibility of a policy reversal to ensure that so-called superdelegates can vote on the first ballot at the party’s national convention. Such a move would increase the influence of DNC members, members of Congress and other top party officials, who now must wait until the second ballot to have their say if the convention is contested…

If Sanders wins the Iowa caucuses on Monday and continues to gain momentum, it is possible he could arrive at the convention with the most delegates — but without enough to win the nomination on the first ballot. It is also possible that he and Elizabeth Warren, a fellow progressive, could arrive at the convention in second and third place, but with more delegates combined than the frontrunner.

If, on the second ballot, superdelegates were to throw their support to someone else, tipping the scales, many moderate Democrats fear the upheaval that would cause could weaken the eventual nominee.