WASHINGTON (Reuters) -President Donald Trump on Sunday called Elon Musk's plans to form a new political party "ridiculous," launching new barbs at the tech billionaire and saying the Musk ally he once named to lead NASA would have presented a conflict of interest given Musk's business interests in space. A day after Musk escalated his feud with Trump and announced the formation of a new U.S. political party, the Republican president was asked about it before boarding Air Force One in Morristown, New Jersey, as he returned to Washington upon visiting his nearby golf club. Shortly after speaking about Musk, Trump posted further comments on his Truth Social platform, saying, "I am saddened to watch Elon Musk go completely 'off the rails,' essentially becoming a TRAIN WRECK over the past five weeks."