HAVANA - A group of US lawmakers is working at easing dialogue between Washington and Havana, as President Barack Obama's administration weighs plans to drop its decades-old strategy of isolating communist Cuba. The Senate Foreign Relations Committee's top Republican Richard Lugar, who in February said decades of US sanctions on Havana had failed, wrote to Obama in a March 30 letter that: "additional (US) measures are needed... to recast a policy that has not only failed to promote human rights and democracy, but also undermines our broader security and political interests." U.S. Congressman [Bobby Rush], left, and Rep. [Barbara Lee], D-Calif, second from right, attend a ceremony in front of Martin Luther King monument in Havana, Saturday, April 4, 2009. Seven members of the Congressional Black Caucus arrived in Cuba last Friday to discuss improving relations with the communist government amid speculation that Washington could ease travel restrictions to the island.