US President Barack Obama will visit London to urge British voters to stay in the European Union.
The Independent on Sunday newspaper reported that Obama is due to attend a technology fair in Germany in late April and a source says he will visit the British capital around that time.
Britons vote in June on whether to remain part of the world's biggest trading bloc and Obama has previously said he wants Britain to stay in the EU and help maintain the post-war transatlantic partnership.
Most opinion polls show voters are split with a large number of people as yet undecided.
The White House declined to comment and British Prime Minister David Cameron's office did not offer an immediate comment when contacted by Reuters.