President Donald Trump took aim at Elon Musk after his former adviser announced the creation of a new political party following staunch opposition to the president's signature legislation.

President Donald Trump said he was "saddened to watch Elon Musk go completely 'off the rails'" in recent weeks.

"I am saddened to watch Elon Musk go completely 'off the rails,' essentially becoming a TRAIN WRECK over the past five weeks. He even wants to start a Third Political Party, even though they have never succeeded in the United States - The System seems not designed for them,