Entering the final stretch of an arduous process, the Republican-controlled Senate began voting Monday on amendments to President Donald Trump's massive tax cut and spending bill, with the goal of passing it later in the day.

Elon Musk warned that he would boost primary challenges against Republican lawmakers who vote for President Trump's so-called "big, beautiful bill."

(Reuters) -Billionaire Elon Musk reiterated his criticism of U.S. President Donald Trump's spending legislation on Monday, arguing that it underscores the need for a new political party. The Tesla chief slammed the "insane spending" of the bill,