STEELTON, Pa. (AP) – The Republican challenger trying to flip the U.S. Senate seat in swing-state Pennsylvania says he’ll press for U.S. military action in Mexico to target fentanyl trafficking networks. David McCormick is proposing a controversial and complicated idea that seemed to originate with former President Donald Trump. McCormick is challenging Democratic Sen. Bob Casey of Pennsylvania. The issue of fighting fentanyl is playing a big role in the campaign. McCormick envisions using the U.S. military’s drones and special operations teams in Mexico to destroy fentanyl trafficking cartels. Critics say such operations would do little to hurt the cartels or stem the flow of fentanyl, while raising delicate questions about sovereignty.