 On 1 June 2017, US President Donald Trump announced that the United States would withdraw from the agreement.In accordance with Article 28, as the agreement entered into force in the United States on 4 November 2016, the earliest possible effective withdrawal date for the United States is 4 November 2020.If it had chosen to withdraw by way of withdrawing from the UNFCCC, notice could be given immediately (the UNFCCC entered into force for the US in 1994), and be effective one year later.