Through a panoramic series of actions, President Donald Trump is transforming the federal government into a vast machine for rewarding his allies and punishing those he considers his adversaries.

Trump warns his former ally against backing any Democratic candidates to challenge the Republicans, as a messy feud between the two escalates.

U.S. President Donald Trump, in an interview with NBC News on Saturday, said there would be "serious consequences" if billionaire Elon Musk funds Democratic Party candidates to run against Republicans who vote for Trump's sweeping tax-cut bill.