By Rodrigo Campos and Marc Jones NEW YORK/LONDON (Reuters) -Argentina's financial assets rallied for a third straight day on Wednesday after U.S. Treasury Secretary Scott Bessent detailed massive support for Argentine President Javier Milei's right-wing government and the country's markets. Bessent said the U.S. was in negotiations over a $20 billion currency swap line with Argentina's central bank, and said it was prepared to purchase Argentina's dollar-denominated bonds in the secondary market. The ...