MACUNGIE, Pa.—President Donald Trump visited Mack Trucks’ Lehigh Valley Operations to tour the facility and highlight American manufacturing during a speech on June 23. “For more than 100 years, this legendary company has been making trucks right here in eastern Pennsylvania, building the heavy-duty machinery that keeps our economy rolling, our factories moving, and our industries roaring all across the nation,” Trump said, noting the “Made in the U.S.A.” markings on all Mack Trucks. “You built this country, and you’re the ones who are making America great again,” he told a boisterous crowd, overflowing with standing-room-only attendees. Mack Trucks, a subsidiary of Volvo Group, maintains its primary facility in Macungie, encompassing 1.7 million square feet and including a massive warehouse operation....