More than 100 Democrats from the US House of Representatives have called on the UN to take responsibility for introducing cholera to Haiti. It is the latest twist in the allegation that UN peacekeepers unwittingly introduced the disease.
The United Nations' envoy to Haiti, Bill Clinton, has accepted UN soldiers may have brought cholera. But with more than 7,000 deaths so far, the UN said tackling the disease is more important than attributing blame.
In a letter to the US Ambassador to the UN, Susan Rice, the 104 members of Congress stated clearly: Cholera was brought to Haiti due to the actions of the UN.
They call on Ms Rice to pressure the UN to confront and ultimately eliminate the disease. The letter says the UN should help Haiti mobilise enough money to build water and sewage systems to tackle the disease.
While members of Congress often weigh in on foreign policy issues like Iran or Israel, it is unusual for so many members to sign a letter about a small Caribbean state like Haiti.
Mr Clinton has acknowledged that UN soldiers were the proximate cause of the cholera. But UN officials shy away from taking full blame or issuing an apology.
They say tackling the disease is more important than apportioning blame.
They may also be reticent because Haitian and US lawyers are trying to sue the UN for financial compensation for the victims of cholera.
The suspects are Nepalese forces, where cholera is endemic while Haiti has been free from the scourge for over a hundred years. Cases have also appeared in neighbouring Dominica republic and Cuba.