By Kiyoshi Takenaka BUENOS AIRES (Reuters) - The Trans-Pacific Partnership (TPP) would be meaningless without U.S. participation, Japan's Prime Minister Shinzo Abe said on Monday as U.S. President-elect Donald Trump said he would withdraw the United States from the pan-Pacific free trade deal. Abe, who attended a gathering of TPP leaders in Lima on Saturday, said there was no discussion at the meeting that other members should try to put the TPP into effect without the United States, Abe told reporters in Buenos Aires.