The Labour leader's 'brush-by' with Barack Obama is designed to help fashion the image of an international statesman in waiting.
President Barack Obama is about to deliver a highly anticipated speech in which he is expected to answer criticism of his foreign policy.
President Obama delivered gag after gag at the annual event - targeting Fox News and joking about the NSA security scandal among others.
US President Barack Obama has reiterated his support for Egypt's attempt to reach a cease-fire between Israel and the Palestinians, to stop more deadly clashes.
"The Israeli people and the Palestinian people don't want to live like this," he said.
He said he would continue to encourage a diplomatic outcome.
A walkabout in Denver took a turn for the surreal when the President of the United States shook hands with a man in a horse's head mask.
Barack Obama was caught by photographers smiling and shaking hands with the joker on the unscheduled meet-and-greet around the American city yesterday.
Mr Obama - and his Secret Service bodyguards - seemed unphased by the encounter and he continued on his route.
The reason as to why an apparent grown man decided to meet the President in a horse's head mask remain unclear.
President Barack Obama has urged Israel and Palestinians to seek a peaceful, two-state solution, calling for a "viable, independent Palestinian state".
Writing in the Israeli newspaper Haaretz, Obama states: "Just as the Israeli people have the right to live in the historic homeland of the Jewish people, the Palestinian people deserve the right to self-determination".
"At the end of the day, we know where negotiations must lead - two states for two peoples
"The only solution is a democratic, Jewish state living side-by-side in peace and security with a viable, independent Palestinian state."
His article follows growing tension in the region after the murder of a Palestinian teenager.
President Obama made a phone call to US football captain Clint Dempsey and goalkeeper Tim Howard following their elimination from the World Cup at the hands of Belgium.
A read-out of the conversation said the President had commended the players not just for their performances but for "carrying themselves in a way that made the country proud".
The statement also said the President had remarked how "captivating" the team's displays in Brazil had been.
US President Barack Obama has condemned the "senseless act of terror against innocent youth" after the killings of three Israeli teenagers.
"On behalf of the American people I extend my deepest and heartfelt condolences to the families of Eyal Yifrach, Gilad Shaar, and Naftali Fraenkel – who held Israeli and American citizenship," Mr Obama said in a statement.
"As a father, I cannot imagine the indescribable pain that the parents of these teenage boys are experiencing. The United States condemns in the strongest possible terms this senseless act of terror against innocent youth."
Israel's president Benjamin Netanyahu earlier vowed to make Hamas - the group he holds responsible for the deaths - pay, but Mr Obama urged both Israel and the Palestinian Authority to work together and "refrain from steps that could further destabilise the situation".
Russian President Vladimir Putin discussed proposals for peace in Ukraine with the US President Barack Obama today, the Kremlin said in a statement.
Speaking on the phone, the two leaders discussed the Ukrainian military ceasefire that was declared by President Petro Poroshenko last week.
Mr Obama urged Mr Putin to support the peace plan and said Moscow would face further "costs" if it did not take steps to reduce tensions in the country, the White House said.
Barack Obama says Iraq's current conflict is the result of sectarian divisions that have been allowed to fester.
The US President said on Thursday that he would send up to 300 military advisers to the country to aid the fight against the group ISIS.
"Some of the forces that have always possibly pulled Iraq apart are stronger now, (and) those forces that could keep the country united are weaker," he told NBC Nightly News.
"It is ultimately going to be up to the Iraqi leadership to try to pull the politics of the country back together again."
President Barack Obama's statement on Iraq due to take place at the White House has been delayed by half an hour.
Obama is expected to speak on the current situation in the country at 6.15pm after a meeting with his national security team.
Barack Obama has posted a video on via the White House Twitter page to say "Go Team USA. Show the world what we are made of" as America took on Ghana in the World Cup.
The US President has not handed down any orders for US military airstrikes against ISIS militants threatening Baghdad, or any other military intervention in Iraq, senior US defence officials have told NBC News.
The officials could not say whether President Obama had also made a decision regarding possible US military action in Iraq.
Some 100 American soldiers and Marines arrived in Baghdad overnight to provide additional security for the US embassy and assist in any evacuations if necessary.