May 13 (UPI) -- A group of opposition lawmakers in Argentina filed an expansion of an impeachment request against President Javier Milei, warning of a "concrete and verifiable risk" that the country could become militarily involved in a potential U.S.-driven action against Cuba. Under Argentina's legislative system, an expansion of an impeachment request involves adding new facts, arguments or evidence to existing complaints against a public official, in this case the president, for evaluation