Ex-secretaries of the transatlantic alliance said the UK should stay in the EU - or risk weakening its security.Read the full story ›
David Cameron and Boris Johnson have laid out their opposing views on Brexit - with the prime minister warning that leaving the EU could increase the prospect of war and terrorism.
Mr Cameron also invoked wartime imagery, suggesting that leaving the EU could take Britain back to a time of 1940s-era instability.
Mr Johnson, meanwhile, dismissed the prime minister's arguments and suggested that the EU results in a "loss of democratic control".
ITV News Political Editor Robert Peston reports:
The Conservative MP put forward the case for Brexit and denied that leaving the EU would put Europe's peace at risk.Read the full story ›
The prime minister has emphasised the UK's historic links with continental Europe as he made a "patriotic case" for a Remain vote.Read the full story ›
Outgoing Conservative mayor Boris Johnson has congratulated Labour's Sadiq Khan on being elected his successor, and thanked Conservative candidate Zac Goldsmith for his "heroic efforts" during the campaign.
"Many congratulations to Sadiq on securing a huge mandate to do the best job in British politics. I wish him every possible success and will be calling him in the morning.
I have also been in touch with Zac and thanked him for his heroic efforts to carry the Conservative banner in our city, in spite of the strong headwinds he faced at this stage in the political cycle.
I believe the high turnout is proof once again that the London mayoralty is now firmly established in the public mind, and I have no doubt the incoming mayor will be able to use the growing powers of the job to deliver improvements in the lives of Londoners.
The prime minister has said the debate over Britain's EU membership has affected his long-term friendship with the mayor of London.Read the full story ›
Boris Johnson has attacked the prime minister for achieving "two thirds of diddly squat" in his pre-referendum negotiations with Brussels.
The London Mayor hit back at his critics for "crowing too soon" in his Daily Telegraph column.
On his visit to the UK, Obama said being part of the European Union "enhances Britain's global leadership".
So I gather they think it's game over. The Bremainers think they have bombed us into submission.
They think that we have just seen the turning point in the referendum campaign, and that the British people are so intimidated by these testimonials - American presidents, business leaders, fat cats of every description - that they now believe the British people will file meekly to the polls in two months time and consent to stay in the EU; and thereby to the slow and insidious erosion of democracy in this country.
If that is indeed the view of the Remain campaign, they are crowing too soon.
Boris Johnson was heckled in Newcastle as he attacked David Cameron for "shamefully" spending £9.3 million of taxpayers' money on a pro-EU leaflet.
The London mayor criticised the "scared" tactics of the remain campaign as he continued his northern "Brexit blitz" tour.
But Boris had the start of his speech interrupted, with hecklers shouting "no Tories in Newcastle".
A group of women were escorted from the building.
Boris Johnson, who announced he is backing the Vote Leave campaign in the EU referendum, is making a speech on the first day of campaigning in Manchester.
Watch his speech live at the Old Granada Studios, Manchester:
- The live broadcast has now ended.
It has been a day of revelations, with some of the UK's most high-profile politicians offering the public a glimpse into their tax affairs.
Chancellor George Osborne released his figures from last year, showing that he earned a taxable income of £198,738 and paid £72,210 in tax.
London Mayor Boris Johnson published four years of records, revealing a total taxable income of £612,583. He paid £260,621 in tax.
Labour leader Jeremy Corbyn revealed that he earned a total taxable income of £72,645 and earned an extra £1,850 from other income sources. He paid £18,912 in tax.
ITV News' Julie Etchingham reports: