HARARE, Zimbabwe (AP) — Zambia is accusing the United States of tying a $2 billion deal for critical health assistance to access to the southern African nation’s rich mineral assets, and calling the outgoing U.S. ambassador’s allegations of corruption “mischievous” and “undiplomatic.” The comments by Zambia’s foreign affairs minister, Mulambo Haimbe, on Monday brought into the open simmering tensions over President Donald Trump’s “America First” strategy, which is reshaping aid to Africa into transactional agreements. Some African leaders and health experts have criticized the new U.S. stance and its demands for sensitive health data in exchange for badly needed support for health systems strained by the Trump administration’s dismantling of foreign aid. Some say they would not receive access to health innovations like vaccines in return. The U.S.…