Eighty-five human rights organizations have written to Congress expressing opposition to Trump administration plans to establish a migrant detention facility at Guantanamo Bay for Cubans fleeing their homeland, according to a letter shared with The Guardian on Friday.

The groups described the prospect of additional migrant detention at the military base as "deeply troubling and unacceptable" and expressed "profound concern" about comments made by a top Department of Defense commander last month regarding plans to "deal with" those fleeing any humanitarian crisis on the island.

The letter comes amid broader concerns about immigration detention practices, highlighted by the recent case of Tania Warner, a Canadian mother who was detained with her seven-year-old daughter Ayla by Immigration and Customs Enforcement for nearly three weeks in Texas facilities.

Warner, who was released after the detention period, described the emotional impact of leaving other families behind in what she characterized as difficult conditions. The facilities where Warner and her daughter were held have been described as "unsafe and degrading" according to reports.

The Guantanamo Bay military base has previously been used for migrant detention, particularly during previous waves of Cuban migration. The current administration's consideration of reviving such usage has drawn criticism from the international human rights community, which argues that the base's remote location and military nature make it unsuitable for civilian migrant processing.