Trump congratulates 'special guy' Barletta on win in Pennsylvania
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President TrumpDonald John TrumpMexican presidential candidate vows to fire back at Trump's 'offensive' tweets Elizabeth Warren urges grads to fight for 'what is decent' in current political climate Jim Carrey takes aim at Kent State grad who posed with AR-10 MORE gave his congratulations to Rep. Lou BarlettaLouis (Lou) James BarlettaTrump's infrastructure plan hits a dead end Trump congratulates 'special guy' Barletta on win in Pennsylvania The Hill's Morning Report — Sponsored by CVS Health — Big night for women in primary elections 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 CaseySenators offer tax bill aimed at helping first responders McConnell: Midterms will be 'very challenging' for GOP Trump congratulates 'special guy' Barletta on win in Pennsylvania 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.