President Trump's new team at the Republican National Committee has tapped former RNC executive Sean Cairncross to help run the party's operations and watch its spending in the run-up to the November election... Why it matters: Cairncross, a former RNC chief operating officer, will rejoin the party's staff at a time when GOP critics are pressing the committee to curb what they view as excess spending under former chair Ronna McDaniel. Trump campaign co-campaign manager and incoming RNC chief operating officer Chris LaCivita is bringing on Sean Cairncross to be his number two at the RNC. Cairncross is a lawyer...