WASHINGTON (AP) — American and Nigerian forces have killed a senior Islamic State leader in Nigeria during a joint operation conducted on Friday, U.S. President Donald Trump announced. In a late-night social media statement, Trump disclosed the mission carried out in Africa’s most populous nation but provided limited operational details. He identified the militant as Abu Bakr al-Mainuki and described him as the Islamic State group’s global second-in-command, saying he had attempted to conceal