Barack Obama

Vavine Nadesalingam and Hubert Namani from Papua New Guinea, including Dawna Horton from Vanuatu and the United States and Haroun Rashid, will attend the event, which will take place from June 22-24 in Silicon Valley, California.

Obama's extraordinary denunciation of the presumptive Republican presidential nominee was about far more than a personal intervention on behalf of Hillary Clinton in the ugly general election campaign.

The commander in chief's fury, which seethed out of him in a stunning soliloquy on live television, amounted to a moment of historic significance: a president castigating one of the two people who could succeed him as beyond the constitutional and political norms of the nation itself.

Americans were united in grief, outrage and "resolve to defend our people", he said.

Omar Mateen, 29, killed 50 people and wounded 53 at the Pulse club before being shot dead by police.

The so-called Islamic State group has said it was behind the attack, but the extent of its involvement is not clear.

A statement on its affiliated Amaq news agency said that an IS "fighter" was responsible.

NBC News reported that Mateen had called the emergency services before the attack and swore allegiance to IS.

Muhammad Ali was The Greatest. Period.

If you just asked him, he'd tell you.

He'd tell you he was the double greatest; that he'd "handcuffed lightning, thrown thunder into jail".

But what made The Champ the greatest - what truly separated him from everyone else - is that everyone else would tell you pretty much the same thing.

'I keep a pair of his gloves'

Like everyone else on the planet, Michelle and I mourn his passing.

Obama said that "71 years ago on a bright, cloudless morning, death fell from the sky and the world was changed."

"A flash of light and a wall of fire destroyed a city, and demonstrated that mankind possessed the means to destroy itself," the President added during his address at the site of the first nuclear bombing.

Obama was not expected to apologize for the U.S. action to hasten the end of World War II and he did not during his 20-minute-long remarks.

Mr Obama did not specifically name the brash New York real estate developer during his remarks at a Rutgers University graduation ceremony in New Jersey, but it was clear he was referring to the candidate who is running on a slogan of "Make America Great Again!"

The President told students not to pine for an American golden age of years past, saying, "the good old days were not all that good", as he pointed out problems with racial discrimination, poverty and lack of equality for women.

He is the first sitting US president to visit since the 1959 revolution, which heralded decades of hostility between the two countries.

Mr Obama said change would happen in Cuba and that Cuban President Raul Castro understood that.

The two leaders met to talk about trade and held a joint news conference.

Mr Castro denied that there are political prisoners in Cuba, telling journalists to "give him a list" and then they would be released "tonight".

"This is a historic visit and a historic opportunity," Obama said as he greeted staff of the new U.S. Embassy in Havana.

Air Force One touched down on a rainy, overcast day in the Cuban capital. The president was joined by wife Michelle Obama and daughters Malia and Sasha.

Obama was greeted by top Cuban officials — but not President Raul Castro. The Cuban leader frequently greets major world figures upon their arrival at Jose Marti International Airport, but was absent on the tarmac. Instead, he planned to greet Obama on Monday at the Palace of the Revolution.

She got 78 percent of the votes, while her rival, Bernie Sanders, could only manage 21.

The win propels Mrs Clinton into this week's crucial "Super Tuesday" voting in 11 states on a wave of momentum.

"Tomorrow this campaign goes national," she told cheering supporters.

Mr Sanders has congratulated her but said the campaign was just beginning.

With almost all the votes counted Mrs Clinton leads Mr Sanders by an almost 50-point margin.

Eight out of 10 black voters backed Mrs Clinton, exit polls suggested, a key section of the Democratic electorate.

Obama's stand won praise at the U.N. climate conference from those who want a strong agreement to reduce greenhouse gas emissions from the burning of coal, oil and gas. But it could rile conservatives in Washington, especially if he tries to put the deal into effect without seeking congressional approval.