The impeachment trial of Vice President Sara Duterte of the Philippines is set to begin on Monday, in a case that has highlighted a bitter fight between the country’s two most powerful political dynasties.

Lawmakers have accused Ms. Duterte, the daughter of the Philippines’ previous president, of embezzlement and of betraying the public’s trust by threatening to assassinate President Ferdinand Marcos Jr., who is also a political scion. The stunning falling-out came just four years after the Marcoses and the Dutertes joined forces in 2022.

Ms. Duterte, who became vice president in 2022 after joining Mr. Marcos’s ticket, has denied the allegations, contending that they were meant to derail her political ambitions. She has announced plans to run for president in 2028, following in the footsteps of her father, the former president Rodrigo Duterte, who is in prison in The Hague, awaiting trial on charges of crimes against humanity for a brutal drug war that he set off.

Last month, Ms. Duterte’s legal team called the case “constitutionally infirm, procedurally defective and substantively deficient.”

In the Philippines, as in the United States, the Senate tries and decides whether to convict an official who is impeached by the House of Representatives. Here is what to know about the proceedings.

Ms. Duterte has been impeached twice.

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