MANILA, Philippines — A brewing leadership coup inside the Senate is reportedly being organized by members of the pro-Duterte bloc in a high-stakes effort to prevent the chamber from fully transforming into an impeachment court once the expected articles of impeachment against Vice President Sara Duterte are transmitted from the House of Representatives. Highly placed Senate sources revealed that at least two to three senators aligned with the Duterte political camp have been working “overnight and nonstop” to secure support for a dramatic leadership overhaul that would remove Senate President Tito Sotto from his post. According to a highly trusted source familiar with the alleged operation, senators and political intermediaries have been quietly approaching members of the Senate, offering political concessions...