Barack Obama is known for keeping a cool head when the temperature rises around him, but this is one situation that's getting the better of him.
The US President recently visited Germany where he was speaking at Brandenburg Gate in Berlin, near the spot where JFK made his famous speech nearly 50 years ago - and it appeared the German capital was in the middle of a heatwave as Mr Obama could not stop the perspiration streaming from his head.
Obama seems to suffer more than most under the hot glare of the sun and the US President is well aware of his unsightly sweaty problem.
US talk show host Jay Leno believes Obama attributes his problem to global warming, Leno recently said "President Obama gave a big speech on climate change. He believes global warming is getting worse because apparently he's sweating a lot more during his second term. So, I think the global warming is increasing".
Here are 23 pictures of Barack Obama sweating his Presidential socks off....