Arnold & Porter Kaye Scholer has stepped into the battle over the legitimate leadership of Venezuela, as it is now working on behalf of Venezuelan opposition leader Juan Guaidó.

The firm had, as recently as January, advised Venezuelan President Nicolas Maduro’s government on such issues as the country’s debt restructuring. But documents filed with the U.S. Department of Justice under the Foreign Agents Registration Act (FARA) indicate that the firm has switched sides and is now working on behalf of opposition leader Guaidó.

Partner Eli Whitney Debevoise II and counsel Arturo Caraballo will advise the Venezuelan opposition on “U.S. economic sanctions, corporate and banking law, U.S. litigation, and international arbitration,” according to the FARA filings, which were submitted Feb. 11.

Debevoise is an international finance partner and former U.S. executive director of the World Bank whose past clients have included the governments of Argentina and Kenya. FARA filings from 2001 list Debevoise as a lobbyist for the government of former Venezuela President Hugo Chavez, along with retired partner Mark Stumpf who represented Venezuela for 35 years.