Theresa May might have excluded climate change from her top priorities at this weekend’s G20 Summit but German Chancellor Angela Merkel and her husband evidently have other ideas.

Ms Merkel’s husband, Joachim Sauer, is taking President Donald Trump’s daughter and other spouses of G20 leaders on a tour of the German Climate Computing Centre in Hamburg on Friday.

Melania Trump had been due to attend but is believed to be trapped inside her hotel in Hamburg due to anti-capitalist protesters surrounding the building. A spokesperson for the US delegation told German media that they had been unable to get clearance for Ms Trump to leave the hotel where she is staying.

Other partners, including Ms May's husband Philip, Emmanuel Macron's wife Brigitte Macron, and Canadian Prime Minister Justin Trudeau's wife Sophie Gregoire Trudeau are currently on the sightseeing tour with Mr Sauer which also involves a boat ride and lunch.

German officials said the idea for the visit came from Ms Merkel's wife who is a professor of physical and theoretical chemistry.

The centre, which uses super-computers to map climate change’s effect on regions across the world, is situated near the safeguarded hall where Ms Merkel, President Trump, and other leaders are meeting.

Ms Merkel’s husband, who is famed for eschewing publicity, has not commented on the visit but his wife has made it clear she is committed to tackling climate change at the summit.

Last month, the Chancellor said the EU is “more determined than ever” to make the Paris accord against climate change a success after Mr Trump’s decision to pull the US out of the agreement. She insisted she would not “overlook tensions” with America during Mr Trump’s maiden attendance at the G20.

G20 Protesters take Hamburg Show all 8 1 /8 G20 Protesters take Hamburg G20 Protesters take Hamburg German riot police use water cannons against protesters during the demonstration during the G20 summit in Hamburg, Germany REUTERS G20 Protesters take Hamburg German riot police clash with protesters during the demonstrations during the G20 summit in Hamburg, Germany REUTERS G20 Protesters take Hamburg Riot police move in through the smoke from a smoke bomb during the "Welcome to Hell" rally against the G20 summit in Hamburg, northern Germany AFP/Getty Images G20 Protesters take Hamburg Riot police use water cannon to put of burning bins as a protester runs off after the "Welcome to Hell" rally against the G20 summit in Hamburg, northern Germany AFP/Getty Images G20 Protesters take Hamburg Protesters throw beer bottles as they shield themselves from water cannon spray during the "Welcome to Hell" rally against the G20 summit in Hamburg, northern Germany AFP/Getty Images G20 Protesters take Hamburg A firefighter works at the scene where a number of cars burnt down during the G20 summit in Hamburg, Germany REUTERS G20 Protesters take Hamburg The interior of a burnt down car is seen as firefighters work in the background during the G20 summit in Hamburg, Germany REUTERS G20 Protesters take Hamburg German police remove a protestor who is blocking a street at a demonstration during the G20 summit in Hamburg, Germany REUTERS

“We cannot expect easy discussions on climate change at the G20 summit,” she said in a speech to German parliament. “Our differences with the US are clear.”