Mr Obama said the wealthy and corporations should pay their "fair share" to cut the deficit.
"Iran's leaders say that their nuclear program is for medical research and electricity, " Mr Obama said.
BBC: Obama Nowruz message: Iran must 'reduce nuclear tension'
Mr Obama said the US was "ready to do our part" to resolve the debt crisis.
Mr Obama said after the summit that the US has "a stake" in the EU's success.
Mr Obama said that he did not want to prosecute those who operated within these rules.
Mr Obama said American forces could remain in Afghanistan in that support role beyond 2014.
BBC: US troops will end 'most' Afghanistan combat this spring
Washington had "a very good estimate" of when Iran could complete a nuclear weapon, Mr Obama said.
"I know that both the prime minister and I prefer to resolve this diplomatically, " Mr Obama said.
But Mr Obama said that the provisions had not hurt trade with Canada - America's largest partner.
"What we are celebrating is not the election or the swearing-in of the president, " Mr Obama said.
Speaking in Washington, Mr Obama said North Korea would only achieve security by meeting its international obligations.
Mr Obama said the leaders would discuss economic co-operation and steps they could take to encourage growth.
"There's no magic formula for dealing with an extraordinarily violent and difficult situation like Syria's, " Mr Obama said.
"I have already met Republicans more than half way, " Mr Obama said in the White House Rose Garden.
"Boston is the vibrant, welcoming and world-class city it is today because of Tom Menino, " Mr Obama said.
BBC: Tom Menino steps down after two decades as Boston mayor
On Monday, Mr Obama said he had made it his top national security priority to find Bin Laden.
Moreover, Mr Obama said when announcing the shift, he was acting in part because Congress had neglected to.
"The days when North Korea could create a crisis and elicit concessions, those days are over, " Mr Obama said.
Addressing Iran, Mr Obama said there was still time to resolve the impasse over its nuclear programme through diplomacy.
In his inaugural address, Mr Obama said he would extend a hand to those willing to unclench their fist.
Mr Obama said he would talk more about that in his big speech.
In a speech to a more modest crowd in the local high school, Mr Obama said much the same.
Mr Obama said confidently that Mrs Clinton could beat John McCain, the Republican.
Striking a defiant tone, Mr Obama said leaks to news media could endanger the lives of military and intelligence personnel.
Mr Obama said that while our understanding of the brain was growing, there was still a long way to go.
Mr Obama said the test was a "highly provocative act", and called for "swift" and "credible" international action in response.
Speaking to reporters after talks with King Abdullah II, Mr Obama said there was "profound cynicism" surrounding the peace process.
Mr Obama said he would have more "flexibility" on difficult issues such as the US missile defence plans after November's election.
After talks in Amman, Mr Obama said the funds - if backed by Congress - would help provide more humanitarian aid.
BBC: Obama vows extra $200m to Jordan to help Syrian refugees
Mr Obama said "it is not in Iran's interest" to develop nuclear arms, and that the US would keep options open.
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