With less than a year to go on his presidency, President Barack Obama released a last-ditch plan to close the the detention facility at Guantanamo Bay, a proposal that would include moving some detainees to prison facilities within the United States.

But in an election year, it appears highly unlikely that a Republican-led Congress will do anything to help bring Obama's 2008 campaign promise to to fruition. Several Republicans immediately vowed to block the plan, including U.S. Sen. Marco Rubio of Florida and Senate Majority Leader Mitch McConnell of Kentucky. One Republican senator, Pat Roberts of Kansas, tweeted a video of himself crumpling up the proposal and tossing it in a trash can.

The plan, released Feb. 23, 2016, explains how to proceed with the remaining 91 detainees, a number that includes 35 who are eligible for transfer and 10 in some phase of the military commission process. Since the creation of the detainee facility, nearly 800 detainees have been held at Guantanamo.

In addition to continuing the transfers, the plan includes accelerating the review of certain detainees who have not been charged or convicted.

For 30 to 60 detainees, the plan calls for working with Congress to relocate them "to an appropriate site in the continental United States while continuing to identify other appropriate and lawful dispositions."

The plan doesn't identify a site in particular, but Pentagon officials are known to have visited sites in multiple states, including South Carolina, Colorado and Kansas.

Administration officials said that the United States could operate such a site in the United States for $65 million to $85 million less than what Guantanamo costs, which is about $445 million a year.

Speaking from the White House, Obama once again laid out his his case for closing Guantanamo.

"For many years, it's been clear that the detention facility at Guantanamo Bay does not advance our national security -- it undermines it. ... Moreover, keeping this facility open is contrary to our values. It undermines our standing in the world."

Ken Gude, senior fellow at the liberal think tank Center for American Progress, told PolitiFact that the plan represents the best and most secure manner to close the facility.

Despite this, he added, "there is virtually no chance that Congress will approve this plan in its entirety."

It's worth noting that Obama could do part of his proposal on his own, such as continuing to transfer detainees to other countries. But Congress can block other crucial parts of the plan, including whether some detainees will be allowed into the United States. If Congress prevents Obama from moving detainees to the U.S. mainland, the president could look to move even more abroad, Gude said.

Amnesty International released a statement criticizing the plan to move detainees for continued detention without charges:

"The possibility of a new, parallel system of lifelong incarceration inside the United States without charge would set a dangerous precedent. ... Guantánamo must be closed by addressing the problem head-on, not moving it somewhere else."

The prospects for closing Guantanamo became less likely late in 2015, when Obama signed a broader defense bill on Nov. 25, 2015 that prohibited the use of Pentagon funds to close Guantanamo.

That bill gave the administration a deadline of three months to present a plan to Congress to close the facility, a timeline that led to the current proposal.

Stephen Vladeck, an American University law professor who specializes in national security law, told PolitiFact that "nothing's going to happen until the lame-duck session at the absolute earliest," referring to the part of the current congressional session that takes place after the November election.

In a blog post, Vladeck offered a simple explanation for the absence of any movement: "It's an Election Year, stupid!" He offered only one hope for passage during Obama's term: If a Democrat wins the presidency and the Democrats pick up seats in the Senate, then Obama may have a more willing partner.

"There may well come a point where Republicans in the 114th Congress would rather make a deal with President Obama than leave things to the 115th Congress and his successor," he wrote.

This is one of the promises that we have rated at various times In the Works, Stalled and Broken depending on Obama's action and Congress' interest -- or not -- in closing the facility.

Obama has reduced the population at Gitmo, and the numbers of detainees is slated to keep dropping. But the chances of it closing entirely before his presidency ends appear slim. We will wait to see how his plan progresses during his final year before we give it a final rating, but for now we continue to rate this promise Stalled.