Elon Musk said he’s carrying out his threat to form a new political party after his fissure with President Donald Trump, announcing on social media that he would form the America Party in response to the president’s sweeping tax cuts law.

The decisions illustrate how dissenting voices have little room in the GOP and complicate the party’s path to holding its majorities in the midterms.

Delegates of the Montana Republican Party gathered in Helena Saturday to choose the party’s next chair – a process that took several hours and rules battles to complete.