Human rights groups have sounded the alarm. They warn plans to use Guantánamo Bay to hold Cuban migrants would be unacceptable.

Who is protesting and why

The letter, shared with the Guardian and addressed to members of the US Congress, came from 85 human rights and advocacy organisations. They expressed what they called "profound concern" about comments from senior Pentagon officials that suggested the US military could establish a migrant camp at the Guantánamo Bay naval base if Cuba’s crisis deepens.

Opposition comes from a wide range of groups, including legal teams and faith organizations.

The signatories include the Center for Constitutional Rights, which has litigated on behalf of detainees at Guantánamo in the past, the Center for Victims of Torture, a chapter of Amnesty International, the Center for Economic and Policy Research, Refugees International, the justice team at Sisters of Mercy of the Americas, the Council on American-Islamic Relations and the Detention Watch Network. Their combined appeal asks lawmakers to ensure no further funding goes towards detention facilities at the base and to prevent any use of Guantánamo for mass detention of migrants.

One of the letter’s central points is political: the groups argue that policies of sanctions and the longstanding embargo against Cuba are helping to precipitate the humanitarian strain prompting migration. They urged Congress to end what they called coercive measures that, they say, are worsening living conditions on the island.

What the Pentagon said

A senior Department of Defense commander told Congress on 19 March that the Pentagon could "set up a camp" at Guantánamo Bay to cope with migrants in the event of what a Republican senator termed "any humanitarian crisis" in Cuba. The commander’s remarks prompted immediate alarm among civil-society groups who view Guantánamo as uniquely problematic because of its history and legal status.

The proposed move brings back memories of the base’s role during the wars on terror, when detainees were held without the usual protections of US courts. The organisations emphasised that the migrant facilities are legally distinct from the terrorism-related detention centre, but said both have been associated with poor conditions and lapses in due process.

Yumna Rizvi, senior policy analyst at the Center for Victims of Torture, described the prospect as ‘‘outrageous’’. "Guantánamo stands alone in its reputation as the most heinous and dangerous place the US president can possibly send you – outside view, under the radar, beyond the law," she said, adding that the US could provide direct relief to Cubans rather than threaten them with detention.

Humanitarian context and United Nations warning

The letter also came against a backdrop of warnings from the United Nations. In February, UN officials said Cuba could be near a humanitarian "collapse" after steps by the US to restrict fuel shipments and escalate economic pressure on Havana. Those UN comments flagged a precarious combination of shortages and constrained services on the island.

Sanctions and restrictions on oil supplies are singled out in the organisations’ appeal as factors worsening the situation for ordinary Cubans. The groups argue that if US policy is contributing to shortages, then the response should be relief, not detention.

That argument connects to broader debates in Washington about Balancing pressure on authoritarian governments and protection of civilians. Supporters of tougher measures say sanctions and diplomatic pressure are tools for changing behaviour in repressive regimes. Critics counter that such policies often hit the civilian population hardest, compounding hardship and displacement.

Mastheads

Legal and political stakes

Guantánamo Bay occupies an unusual legal position: it's a US naval base on Cuban territory that has been used for decades to house detainees in ways that challenged normal legal protections. That history has made it a lightning rod for human rights lawyers and campaigners.

The organisations’ letter urged Congress to make clear that money won't fund any renewed detention infrastructure at the base. They framed the demand as both legal and moral: preventing additional use of Guantánamo, they said, is part of upholding US commitments to international human rights standards.

Politically, the issue cuts across the usual partisan lines in America. Some Republican lawmakers have argued in favour of strong measures against the Cuban government, citing human rights abuses and democratic repression. Others — including human rights groups — warn that punitive measures often produce humanitarian fallout that the US must address directly rather than exacerbate.

And there’s a fiscal angle. Setting up and maintaining any detention facility overseas would involve direct costs for the US taxpayer, as well as legal and diplomatic expenditures if litigation follows. Those are practical considerations that members of Congress will weigh alongside the moral and legal objections raised by campaigners.

International implications

At a time when alliances and international norms are under scrutiny, the dispute has wider diplomatic resonance. Allies in Europe and agencies at the UN have consistently urged adherence to human rights obligations when dealing with migrants and asylum-seekers. Any move to house civilians at Guantánamo would likely draw criticism from rights bodies and could strain relations with partners who view detention there as incompatible with modern standards.

British ministers haven't been mentioned in the material shared with the Guardian. Still, the debate touches on issues that matter to the UK: how democratic states treat refugees, the use of extraterritorial detention, and the credibility of human rights advocacy when pursued alongside hardline foreign policy.

The groups also warned of reputational damage. For governments that frame their foreign policy around values, the optics of reopening a detention site long associated with rights abuses could undercut diplomatic messaging on human rights and the rule of law.

What happens next

The organisations asked members of both chambers of Congress to intervene promptly. They called for a halt to any funding that might be channelled toward new detention infrastructure at Guantánamo and for a reversal of policies that they say are driving humanitarian harm in Cuba.

Whether lawmakers will act is uncertain. Some in Washington emphasise contingency planning in the face of unpredictable crises in the Western Hemisphere. Others will likely respond to the combined pressure of legal advocacy groups, faith-based organisations and international bodies concerned about humanitarian protection.

There are practical questions too: how a large-scale migrant reception operation at a military base would be run, what legal status migrants would have while held there, and what oversight mechanisms would apply. Those details matter to lawyers and advocates who fear a repeat of past procedural and human rights failings.

One-sentence paragraph for impact.

The signatories argued that the better response is to remove the causes of displacement rather than expand detention capacity.

That stance points back to the central policy dispute: whether the US should increase pressure on Cuba through economic restrictions or prioritise humanitarian channels and diplomatic relief to reduce the need for migration.

It is a question that combines law, politics and practical care for people on the move — and it's now on the desks of US lawmakers who will have to weigh competing pressures and consequences.

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The letter was signed by 85 organisations, including the Center for Constitutional Rights and the Center for Victims of Torture.

This article was created with AI assistance.