President Trump said Sunday that all federal agencies must purchase American-made products—“no excuses” permitted—as he looks to eliminate loopholes that have historically allowed the government to buy foreign goods when domestic alternatives are unavailable, too costly or don’t reach specific thresholds. “ALL FEDERAL AGENCIES MUST BUY AMERICAN—NO EXCUSES!” Trump wrote on Truth Social. “For decades, Washington politicians sent your Taxpayer Dollars overseas, and let Foreign Countries rip us off while our Workers, Factories and Supply Chains were left behind. That betrayal is OVER.” Chief among the laws governing domestic procurement is the 1933 Buy American Act, which decrees that federal agencies prioritize “domestic end products” and “construction materials” for stateside projects. Under current regulations, a product is defined as domestic if it’s manufactured in the United States and at least 65 percent of its component costs are American in origin.…