DEISY BUITRAGO and VIVIAN SEQUERA JULIO Borges, the politician who serves as foreign minister for Venezuela's U.S.-backed interim government, said on Sunday he would leave his post, further weakening the opposition just weeks after it was routed in regional elections. The United States and dozens of other countries recognize the interim government, led by Juan Guaido and formed at the beginning of 2019, and consider the 2018 re-election of President Nicolas Maduro to be fraudulent. The interim government is not serving its purpose, Borges, whose differences with Guaido are well-known, said in an online press conference. "The (interim) government makes…