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Harrisburg, Pa. – Four-term U.S. Rep. Lou Barletta, a staunch supporter of President Donald Trump who first got national notice as a small-city mayor for his attempted crackdown on illegal immigration, on Tuesday won the Republican nomination for U.S. Senate in Pennsylvania.

Barletta had paid little attention to his Republican rival, state Rep. Jim Christiana, during the primary campaign. Instead, he focused his attacks on the candidate he hopes to unseat in the fall, two-term Democratic Sen. Bob Casey.

Barletta is a favorite of Trump, whom Barletta endorsed in 2016. Trump asked Barletta to run for Senate, and the president is expected to visit Pennsylvania to campaign for him.

Casey, who was unopposed for the Democratic nomination, has opposed Trump’s Supreme Court pick, many of his highest-profile nominees and the GOP tax-cutting law.

Casey is among 10 Democratic senators seeking re-election this year in states won by Trump, making Casey a target for Republicans.

Tuesday’s primary elections were also expected to settle swing state Pennsylvania’s chaotic congressional landscape after a court fight ended with redrawn districts just three months ago.

Meanwhile, Idaho voters were set to pick their Republican gubernatorial nominee, while heavily Republican Nebraska and Democratic-leaning Oregon were also holding primaries Tuesday.

A look at some of the key races:

Republicans outnumber Democrats in Pennsylvania’s House delegation, though a new congressional map is making the state a focal point of Democrats’ effort to reclaim House control in November.

Eighty-four candidates were running in 18 House districts in light of new court-ordered redrawn congressional district maps in February.

Pennsylvania state senator and waste-hauling millionaire Scott Wagner won the Republican nomination to challenge Democratic Gov. Tom Wolf.

Wagner defeated first-time candidates Paul Mango and Laura Ellsworth.

In Nebraska: Sen. Deb Fischer has won the Republican nomination in her bid for a second term in office. While Nebraska Gov. Pete Ricketts easily won the Republican nomination to seek a second term in November

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