Mr Trump said the Paris agreement disadvantaged the United States, and that he hoped to seek "a better deal".
"We're getting out," he said.
"The United States will withdraw from the Paris climate accord but begin negotiations to re-enter either the Paris accord or an entirely new transaction, on terms that are fair to the United States, its businesses, its workers, its people, its taxpayers."
The United States will cease implementation of non-binding elements of the accord "as of today".
