Rapper Nicki Minaj  dropped the mic at the United Nations Tuesday , delivering a stark warning about the plight of Christians being “targeted, driven from their homes and killed” in Nigeria. Minaj was invited to address the international body by US Ambassador Mike Waltz, who hailed her as a “fearless advocate” whose message “echoes the UN’s own Universal Declaration of Human Rights.”  “She steps onto this world stage not as a celebrity, but as a witness,” Waltz gushed. “She could be living the