Washington - A lack of unanimity in both political parties toward President Barack Obama's sudden move to re-establish ties with Cuba complicates any congressional effort to scuttle the most significant change in US policy toward the communist island in 50-plus years.His initiative faces some strong resistance among lawmakers, with criticism coming mostly from Republicans, who say the new policy rewards Cuba's decades-long policies of repression, human rights abuses and aggression. Some prominent Democrats voiced opposition, too.Opponents spoke of holding up money to set up a full-service US embassy in Havana, blocking Obama's nominee as ambassador to Cuba or other such steps.But even if they were to pass sweeping legislation to stop what Obama wants to do, he could veto it and they are unlikely to muster the two-thirds majority to override a veto.The Republicans will control both the Senate and House come 6 January, but they will face pressure from businesses and the farm industry - eyeing opportunities for commerce in Cuba - not to stand in the way of expanded ties.The US declared an embargo on most exports to Cuba in October 1960 and severed diplomatic relations in January 1961. Three months later Fidel Castro declared Cuba a socialist state - just a day before the doomed, US-sponsored Bay of Pigs invasion meant to topple him.After Castro became ill in 2006, his brother, Raul, took charge of the nation.Now Obama says he will ease economic and travel restrictions on Cuba and work with Congress to end the trade embargo. This came after Cuba released American Alan Gross, who had been imprisoned for five years, and a Cuban who had spied for the US. In exchange, the US freed three Cubans jailed in Florida.Obama's move praisedSenator Patrick Leahy, one of three lawmakers who flew to Cuba before dawn to escort Gross home, praised Obama's move.Leahy, the top Democrat on the committee that oversees foreign aid, said that over the years he's heard members of Congress tell presidents, "Hang tough on Cuba and those Castros will be out of there any day now.""That was said to President Kennedy, President Johnson, President Nixon, President Ford, President Carter - you see what I'm driving at," Leahy said. "The fact is they are there. The fact is, Cuba is still there.Another Democrat, New Jersey Senator Bob Menendez, the outgoing chairperson of the Senate Foreign Relations Committee, voiced opposition to the new Cuban policy.Menendez, whose parents are Cuban immigrants, said Cuba is not going to reform just because Obama believes that if he extends his hand in peace, the Castro brothers suddenly will "unclench their fists".Splits were evident on the Republican side, too.Senator Marco Rubio, a Cuban-American and potential presidential candidate, said the new US policy would give Cuba a needed economic lift - something "the Castro regime needs to become permanent fixtures in Cuba for generations to come".More telling for the outlook in the new Congress was the response of Senator Bob Corker, the incoming chairperson of the Foreign Relations Committee, who was cautious but not critical of Obama's action.