Madonna has launched a fierce attack on Donald Trump, branding the president a "Nazi", "sociopath" and "white supremacist pig".

The 61-year-old posted a lengthy statement on Instagram after Trump bizarrely suggested that the US should stop testing members of the public for coronavirus in order to reduce the number of confirmed cases.

The 'Crazy For You' singer also criticised the president, who is up for re-election this November, for his underwhelming response to the horrific death of George Floyd on US soil last month.

"Let me get this straight........" she began. "Lets slow down testing of Covid in America because the numbers of people testing positive are getting too high for Trump to deal with..........

"And lets make it a law for anyone who burns the flag to go to jail for one year but lets have no law or reform or consequences put in place for Police officers who shoot and kill black victims for no reason!!

"Finally- Trump is upset about George Washingtons image being desecrated even though George Washington owned Slaves!!

"Ill take Sleepy Joe Biden any day over this White Supremacist [pig emoji] Aka/ Nazi Aka Sociopath thats in The WHITE HOUSE! Time to Wake Up."

Prior to coronavirus and Floyd's death, Trump had been considered a certainty for a second term but is now trailing Democratic contender Joe Biden, according to the bookies.