U.S. oil companies want "serious guarantees" from Washington before they make large investments in Venezuela, as President Donald Trump urges them to back his bid to reshape energy markets, the Financial Times reported on Wednesday. U.S. officials held talks with top energy executives in Miami on Wednesday, the FT reported, citing people familiar with the matter. The talks come as Washington and Caracas progress in negotiations to supply up to 50 million barrels of Venezuelan oil to the United States and President Donald Trump presses American oil companies to invest in the South American country's energy sector.