Former US president Donald Trump has resigned his membership in a top actors’ and screen union that was reviewing disciplinary action against him after his supporters stormed the US Capitol in a January 6 attack that left five people dead.

In a letter to the Screen Actors Guild – American Federation of Television and Radio Artists (SAG-AFTRA), Mr Trump slammed the union’s planned hearing after the board found in January that there was probable cause that he had violated its terms over the attack.

“Who cares!” Mr Trump wrote in the letter, provided by a spokesman.

“I no longer wish to be associated with your union.”

“Thank you,” the guild responded in its own statement.

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The US House of Representatives voted to impeach Mr Trump on January 13, charging him with inciting an insurrection in the rampage at the Capitol.

Mr Trump, a Republican, left office on January 20 after losing last November’s presidential election. He faces trial in the Senate next week on the impeachment charge.

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On January 19, SAG-AFTRA, which represents some 160,000 actors, journalists and other media professionals, said it would review Mr Trump’s role in the riot, saying he had “attacked the values that this union holds most sacred: democracy, truth, respect for our fellow Americans of all races and faiths, and the sanctity of the free press”.

Mr Trump was a SAG-AFTRA member for more than 30 years thanks to his roles in films such as Home Alone 2 and Zoolander, as well as TV show The Apprentice.