President Barack Obama urges Democrats to carry onetime rival Hillary Clinton to victory in November as America's first woman president, while savaging her Republican opponent Donald Trump for fueling hate and division.

Vigils have been held in Orlando, Florida, and around the world for the victims of Sunday's deadly gun attack on a gay nightclub.

Hillary Clinton's snarky tweet to her White House rival Donald Trump was among the funniest of the campaign. Almost as funny as it was awkward.

President Barack Obama pays tribute to the "silent cry" of the 140,000 victims of the atomic bomb dropped 71 years ago on Hiroshima, and called on the world to abandon "the logic of fear" that encourages the stockpiling of nuclear weapons.

The US justice department is seeking the death penalty in the case of the Charleston church shooting which claimed nine lives last year.

An Army captain sued President Barack Obama on Wednesday, alleging that he doesn't have the proper congressional authority to wage war against Islamic State militants in Iraq and Syria.

Nine Yemeni prisoners from the Guantanamo Bay detention facility in Cuba have arrived in Saudi Arabia after being transferred, US officials say.

Hillary Clinton and Bernie Sanders come to blows in a heated US presidential debate in Brooklyn, raising the stakes in their increasingly acrimonious race to clinch the Democratic nomination.

President Barack Obama has opened his final presidential campaign — against Donald Trump.

President Barack Obama's plans to regulate emissions of carbon dioxide from US power plants have been stalled by the US Supreme Court.

President Barack Obama will make his first visit as president to a US mosque next week in a defence of religious freedom, the White House said, following a rise in anti-Muslim rhetoric in the United States.

The Republican dominance in the House has been fuelled by the spectacular rise of conservative media which directly helped the rise of the Tea Party movement, a grassroots, non-college white protest against President Barack Obama's healthcare programme.

One should not be surprised if Washington re-establishes diplomatic ties with Tehran before the end of President Barack Obama's term in November 2016. However, what will be the fate of the JCPOA after the November 2016 US presidential elections is anyone's guess, particularly if a Republican is elected to the White House.

President Barack Obama told Americans nervous about terror and the changing economy that they should not fear the future, in a farewell State of the Union address that drew sharp contrast with Republicans.

United States President Barack Obama approved a bill on Monday banning soaps, toothpastes, and bodywashes that contain a harmful ingredient.

President Barack Obama says the US "will not be terrorised" by Wednesday's mass shootings in San Bernardino, California.

Barack Obama and other world leaders arrive in Turkey on Sunday for a summit after attacks in Paris pushed the fight against IS to the top of the agenda.

Paris attacks seem likely to compel President Obama to consider military escalation against IS in Iraq and Syria. But that probably will not mean dramatic moves like launching US or international ground offensive or accelerating aerial bombing in hopes of eliminating the global threat of violent extremism.

The White House welcomed flocks of costumed children to its annual Halloween event where President Barack Obama and his wife, Michelle, gave out candy and fruit bars.

President Barack Obama says the US has launched a "full investigation" into air strikes that killed 19 people at an MSF-run Afghan hospital.