What started as a volley of barbs snowballed into a feud involving multiple social platforms and millions of onlookers, as everyone from big-name politicians to no-name meme accounts hurried to offer their takes and declare their allegiances.

Donald Trump's former allies say the political battlefield is littered with the scorched remains of those who have had a falling-out with him.

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.