A group of U.S. lawmakers has called for an investigation into whether Washington’s efforts to transfer North Korean funds from a Macao bank are in violation of U.S. laws on money laundering and counterfeiting.

Six Republicans, including Representative Ileana Ros-Lehtinen of the House Foreign Affairs Committee, asked that the Government Accountability Office to examine whether moves by the State and Treasury departments to facilitate the money transfer have broken any laws.

In a letter to the investigative arm of Congress, the members of Congress called reports on the government's efforts to transfer the North Korean funds from Banco Delta Asia "disturbing."

Ros-Lehtinen also raised the question of whether resolving the money transfer dispute would actually lead to North Korea’s nuclear disarmament.

She said in a statement that if history is any indication, she has little confidence that Pyongyang will adhere to any kind of agreement, despite Washington’s good faith efforts to honor its part of the bargain.