The Finnish Prime Minister, Sanna Marin, is facing a backlash after she was seen partying in a leaked video.
In the footage, believed to be taken from social media, he and friends including Finnish celebrities are seen dancing and singing.
He has faced criticism from opposition parties, with a leader demanding that he undergo a drug test.
Ms Marin, 36, denied taking drugs, saying she only drank alcohol and simply parted ways “brightly“.
Personality: Who is Sanna Marin?
The world’s youngest prime minister makes no secret of partying and is often photographed at concerts.
Last year he apologized for leaving the club after coming into close contact with a Covid-19 case.
Just last week, Ms Marin was dubbed “the best prime minister in the world” by the German news outlet Bild.
Commenting on the video on Thursday, she said that she knew it was being filmed, but was upset that the video had become public.
“I danced, sang, and participated — totally legal things. And I’ve never been in a situation where I saw or knew others [using drugs],” she said.
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The leader of the opposition party, Rikka Purra, asked Ms Marin to take a voluntary drug test, saying a “shadow of doubt” hangs over the prime minister.
Other opposition party politicians have criticized both the prime minister and the media for talking of partying rather than more important domestic problems.
Defending herself, she told reporters: “I have a family life, I have a work life and I have free time to spend with my friends. Same as people my age.”
The politician said there was no need for him to change his behaviour. “I’m going to be exactly what I’ve been so far and I hope to be accepted,” she said.
Ms Marin has been in power since December 2019 and continues to support her party.
Finnish political journalist and media commentator Robert Sundmann told the BBC: “Marines: the reaction to all things polarized is very specific.”
“People are saying that it’s normal for a woman of her age to have fun with her friends and surprise people.
“But at least so far one thing is certain: photos from the previous party have not – at least significantly – affected the popularity of his party.”
Mr Sundarman said much attention has been paid to his friendship with Finnish celebrities, which he says is a significant departure from previous prime ministers.