Trump made the prediction Tuesday that Republicans are “going to win” this year’s midterms during rah-rah remarks at the National Republican Congressional Committee’s annual March fundraiser. (March 20) AP

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.

Meanwhile state Rep. Rick Saccone lost a two-way Republican primary in a newly drawn congressional district in Pennsylvania, barely two months after losing to Democrat Conor Lamb in a special election for a different U.S. House seat.

Trump edged Democrat Hillary Clinton by less than 1 percentage point in Pennsylvania in 2016’s presidential election. Republicans control the Senate, 51-49, and defeating Casey would give Republicans one more pro-Trump vote to help advance the president’s agenda.

Still, defeating Casey in November’s election is a tall order.

Casey, the son of a late former governor, has strong name recognition and has won five statewide elections, including two as auditor general and one as state treasurer. He also has a huge cash advantage, with about $10 million in the bank at the end of April, compared with Barletta’s $1.3 million.