David Cameron will meet US presidential candidate Mitt Romney at Downing Street today, during Romney's visit to the capital.
The Republican candidate is using the trip to raise campaign funds and canvass for support among London's large American community.
Romney, who is trailing Democrat president Barack Obama by a narrow margin in the latest polls, is also due to meet Deputy Prime Minister Nick Clegg and Labour Leader Ed Miliband.
More top news
Ahead of Hillary Clinton's historic clash with Donald Trump, we look at key moments that changed election outcomes.
An ejector seat manufacturer is to be prosecuted over the death of Red Arrows pilot Sean Cunningham at RAF Scampton in November 2011.
Police said the "active shooter", reportedly a lawyer, had since been shot by officers and they were not seeking any other suspects.