A Downing Street Spokesperson said:
President Trump called the Prime Minister this evening to discuss his decision to pull the US out of the Paris Agreement.
The Prime Minister expressed her disappointment with the decision and stressed that the UK remained committed to the Paris Agreement, as she set out recently at the G7.
She said that the Paris Agreement provides the right global framework for protecting the prosperity and security of future generations, while keeping energy affordable and secure for our citizens and businesses.
The President made clear that the door remains open to future US involvement in the Agreement.
The Prime Minister and President agreed on the importance of continued cooperation on wider energy issues.