Trump congratulates 'special guy' Barletta on win in Pennsylvania
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President TrumpDonald John TrumpOver 100 lawmakers consistently voted against chemical safeguards: study CNN's Anderson Cooper unloads on Trump Jr. for spreading 'idiotic' conspiracy theories about him Cohn: Jamie Dimon would be 'phenomenal' president MORE gave his congratulations to Rep. Lou BarlettaLouis (Lou) James BarlettaObama to hit campaign trail in Pa. for gubernatorial, Senate candidates Poll: Pennsylvania Democrats surging with double-digit leads Poll: Dems hold double-digit leads in Pennsylvania races for governor, Senate MORE on Wednesday for winning his GOP Senate primary in Pennsylvania, calling him a "special guy" who will help his agenda. 

"Congratulations to Lou Barletta of Pennsylvania. He will be a great Senator and will represent his people well - like they haven’t been represented in many years," Trump tweeted. "Lou is a friend of mine and a special guy, he will very much help MAKE AMERICA GREAT AGAIN!"

Barletta, an early supporter of Trump, defeated state Rep. Jim Christiana on Tuesday night to gain the party nomination to challenge Democratic Sen. Bob CaseyRobert (Bob) Patrick CaseyObama to hit campaign trail in Pa. for gubernatorial, Senate candidates Trump is wrong, Dems are fighting to save Medicare and Social Security Five biggest surprises in midterm fight MORE Jr. in November.

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Trump and the Pennsylvania GOP both endorsed Barletta, who has served in Congress since 2011. The president even recorded a last-minute robocall for the candidate, praising his tough stance on immigration and support for the GOP tax bill that passed late last year. 

Polls suggest Barletta faces an uphill challenge to defeat Casey, though Trump won Pennsylvania in 2016.