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At a Labor Day event in Pittsburgh, Pennsylvania Sen. Bob Casey Jr. (D) blasted President Trump over his plan to end the Deferred Action for Childhood Arrivals (DACA) program, the Pittsburgh Post-Gazette reported.

One week after learning of a Trump-backed 2018 challenger, Casey took aim at the president's proposal.

"If the president ends DACA, it's not only wrong and immoral and insulting," Casey said, calling the move "bad for our economy."

Trump is engaging in a "total betrayal of the trust of the federal government," he said during a Labor Day function in the Steel City.

Casey, who has reportedly considered supporting a "single-payer" alternative to ObamaCare, said he wouldn't yet commit to Sen. Bernie Sanders (I-Vt.) legislation, which will be unveiled soon.

The son of the late Gov. Bob Casey (D-Pa.), Casey is facing newfound 2018 competition after Trump ally Rep. Lou Barletta (R-Pa.) announced late last month that he will seek the 57-year-old's seat.

Trump had urged Barletta, a staunch DACA opponent who gained a reputation for cracking down on illegal immigration while mayor of the Coal Region city of Hazleton, to run against Casey.

Illegal immigration and the future of blue-collar labor professions like mining are said to be key issues in their 2018 senate race.

Casey originally defeated two-time presidential candidate Sen. Rick Santorum (R-Pa.) in 2006.

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