A senior U.S. prosecutor resigned Tuesday to protest what she called a politically driven investigation into the Biden administration’s climate policies. Denise Cheung, the top criminal prosecutor in the Washington, D.C., office, wrote in her resignation letter that she had refused an unreasonable request made by Emil Bove, Trump’s former personal attorney who’s now acting U.S. deputy attorney general, to bring criminal charges over Biden-era grants by the EPA to nonprofit groups.