In an expletive-laden tirade at an anti-Trump concert during the inaugural protests in Washington, the singer said that she had “thought a lot” about destroying Donald Trump’s new home after he was sworn in as President on Friday.
Threatening to kill the President is a crime in the US which is punishable with a fine or up to five years in jail, even if it is made as a joke.
A Secret Service spokesman confirmed that it was “aware” of Madonna’s comments and that it had opened an investigation.
WATCH: Madonna admits she 'thought about BLOWING UP The White House'
Emma Watson joins Madonna and Scarlett Johannsson at the Women's March
It will be up to the Attorney General nominee and Trump ally Jeff Sessions, whether or not he wants to follow through with a prosecution.
A Trump administration official hit out at the 58-year-old singer’s aggressive comments yesterday, describing them as “absolutely unacceptable”.
He added: “Had they been said about President Obama there would have been an uproar”.
Madonna is being investigated by Secret Service after her protest speech
Madonna made her remarks on Saturday during an unexpected appearance at the Women’s March in Washington DC, which was attended by about 200,000 people. Speaking to the massed crowds she said: “Yes, I have thought a lot about blowing up the White House…but I know this won’t change anything.”
Yes, I have thought a lot about blowing up the White House…
Madonna also began chanting “I am a nasty woman” in reference to Mr Trump’s insult to his Democratic rival Hillary Clinton during one of the Presidential debates.
She read a poem to the crowd which said “welcome to the revolution of love” and said that women should refuse to “accept this new age of tyranny”.
Wearing a black version of the pink, cat-eared knit cap worn by the “Pussyhat” protesters, she said women were “in danger” under Mr Trump’s administration.
PROTESTS at Trump's Inauguration Day
Fri, January 20, 2017
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Protestors were chased through the streets of Washington as violent scenes broke out close to the Donald Trump inauguration in Washington.
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Police and demonstrators clash in downtown Washington after a limo was set on fire.
The pop star said she had ’thought a lot about’ destroying the White House
US TV networks CNN and CNBC accidentally broadcast Madonna’s foulmouthed outburst as they were showing the speech live. They later apologised.
Madonna was an outspoken supporter of Mr Trump’s Democratic rival Hillary Clinton. She performed an impromptu concert for her in New York’s Washington Square Park on election night in November.
Madonna also had an orange jumpsuit like those worn by prisoners in Guantanamo Bay, the US prison in Cuba.
Madonna was speaking at the Women’s March in Washington DC
While hundreds of thousands marched on Washington, dozens more popular protests occurred in major cities around the world – including Sydney, Berlin and one in London, which drew 100,000 people.
Among those who took part in the protests were celebrity A-listers Lady Gaga, Katy Perry, Emma Watson, Helen Mirren, Cher, Jake Gyllenhaal, Miley Cyrus, Jane Fonda, Chrissy Teigen and Charlize Theron.