The White House is considering a "wide array" of options for closing Guantanamo Bay military prison in Cuba.
The best route for closing the prison would be winning congressional approval to do so, spokesman Josh Earnest said.
But President Barack Obama, who has repeatedly pledged to close the prison, has faced opposition from congressional Republicans who passed laws blocking any move to transfer Guantanamo inmates to prisons in the United States.
Asked if Obama would consider taking executive action to close the prison if Congress blocks him, Mr Earnest said: "The president and his team are always considering a wide array of options.
"But the fact is the best way for us to do this is for members of Congress of both parties to work effectively with the administration".
The White House said last month that it would soon be sending a plan to Congress to close the prison.
Andy Burnham has warned Labour supporters that electing Jeremy Corbyn as leader would mean "giving up" on winning the next election.
The shadow health secretary's intervention came with the left-winger embroiled in yet another row over past comments- this time for suggesting it was a "tragedy" Osama bin Laden was killed by the United States.
Burnham said he was the only candidate capable of getting the Labour party back into power in 2020:
In a bid to appeal to Corbyn supporters, he added: "Don't give up on wanting to see big changes, but don't give up on winning either."
Hundreds of thousands of people signed up for infidelity website Ashley Madison in the last week, even after hackers leaked data about millions of its clients, the parent company Avid Life said today.
Earlier this month, hackers released Ashley Madison customer data after demanding the site be shut down. A second data dump contained thousands of emails and other company documents.
The company also hit back at reports that the site had few genuine female users, saying internal data released by hackers had been analysed incorrectly.
"Last week alone, women sent more than 2.8 million messages within our platform," Avid Life said, adding that 87,596 women had also signed up for Ashley Madison last week.
On Friday Chief Executive Officer Noel Biderman had left the company by mutual agreement.
Barack Obama is to venture into the Alaskan wilderness with British survival expert Bear Grylls to explore the impact of climate change on the environment for a television programme, it has been announced.
The special edition of Running Wild with Bear Grylls will be broadcast later this year on NBC.
Located on the northwest tip of America, Alaska is known for its icy terrain, mountains and freezing temperatures.
Grylls, who has served with the SAS and wrestled sharks and alligators, has taken a string of celebrities on one-on-one adventures to test their survival skills on the series.
So far, actresses Kate Winslet and Kate Hudson and Magic Mike star Channing Tatum have all taken part in the show.