Senator Jeff Sessions, a Republican from Alabama, speaks during a campaign event for Donald Trump, 2016 Republican presidential nominee, not pictured, in Phoenix, Arizona, U.S., on Wednesday, Aug. 31, 2016. Trump returned to form in Phoenix Wednesday night with a nativist immigration plan definitively ruling out legal status for undocumented immigrants, as well as proposing to build a wall on the southern border of the United States and forcing Mexico to cover the cost. Photographer: David Paul Morris/Bloomberg via Getty Images