Trump’s sudden blue-state push faces steep challenges both organizationally and demographically. In several of the states in question, millions of early votes have already been cast, and polling indicates that the planned shift faces hurdles.

Nationally, the contest is tightening in tracking surveys to within the margin of error, but Trump remains behind by mid-to-high single digits — much as Mitt Romney was four years ago — in the states he is hoping to turn into unusual final-week fronts.

According to the latest Washington Post-ABC poll, a majority of all likely voters is unmoved by Comey’s decision, which has spurred a fierce backlash from Clinton backers.

Trump campaign chief executive Stephen K. Bannon has settled on three states in particular — Michigan, Wisconsin and New Mexico — where the candidate and campaign will devote more time and money, said four people familiar with the discussions who spoke on the condition of anonymity to discuss internal campaign talks. All three states were won by Obama in 2008 and 2012.