Polemical documentary film maker Michael Moore has unveiled the first trailer for his new film Fahrenheit 11/9, a new broadside which charts the rise of Donald Trump from reality show host to office of US president and his subsequent rule.

Released on September 21 ahead of the USA’s upcoming midterm elections, the title Fahrenheit 11/9 refers to the date the Associated Press called the election for Trump, while also alluding to Moore's 2004 documentary Fahrenheit 9/11.

Moore, who is known for his antagonistic style, calls Trump the "last president of the United States" and follows his election campaign in 2016, his first year in office, and how Trump's victory has led to division and confrontation in the US over issues of immigration, the far right, fake news, and white supremacy.

Speaking to RTÉ Entertainment in 2016 on the eve of the release of his last film Where to Invade Next Moore advised Irish people to ridicule Trump on a planned but subsequently cancelled visit to Ireland.

Moore has previously said Trump will win the next presidential election in 2020 but speaking to chat show host Bill Maher in June, he said: "I’m finishing my movie and getting it out before the midterms because I want millions of people to get to the polls. We’re going to bring Trump down."

14 years after its release, Fahrenheit 9/11 is still the highest grossing documentary of all time, having taken $222m worldwide.