Donald Trump has been receiving widespread condemnation for his decision to pull the US out of the Paris climate change agreement.
Reports of a potential withdrawal had been circulating, but in a formal statement, the US president made the announcement on Thursday.
Trump claimed the agreement would be a "punishment" to the US, and said he had decided to withdraw in order to protect American jobs. However, this has not been well received by foreign leaders.
Theresa May is reported to have expressed her disappointment to the US president in a phone call, while Germany's Angela Merkel and France's Emmanuel Macron reiterated their commitment to the accord.
A spokesman for the United Nations called it "a major disappointment" while European Union officials labeled the decision "a sad day for the world".
The President said he had wanted to negotiate a new deal, but this possibility had been ruled out by France, Germany, and Italy in a joint statement.