Republican candidates frustrated by their presidential debates are contemplating changes to the remaining debates. The changes may go beyond the GOP chairman's decision to suspend a partnership with NBC News and its properties on a February debate. The complaints have prompted a private meeting Sunday night in Washington - organized by Ben Carson's campaign. Representatives from more than a dozen campaigns are expected to attend. Yet it seems unlikely that the campaigns will reach a consensus, given their competing needs. Even Carson's campaign expects the meeting to achieve "absolutely nothing." The most recent debate, moderated by CNBC in Colorado on Wednesday night, drew the harshest criticism. Some candidates complained that the questions were not substantive enough; others wanted more air time or the chance to deliver opening and closing statements.