Bolstering confidence in the state of negotiations, a spokesman for Iran’s Foreign Ministry said on Wednesday that politics inside the United States will not ruin his country’s continuing nuclear negotiations. The remarks of Marzieh Afkham came after President Barack Obama yielded to Congressional demands that it have rights to review any ultimate accord. Republicans in both houses of the U.S., as well as some Democrats, insisted Obama allow oversight from that body.

At a news conference transmitted on Iran’s state television system, Afkham said that the issues are “related to their domestic affairs,” reiterating that the actual negotiations of his government continue with the American government and others, not the legislative branch of the U.S. The negotiations are intended to relieve the imposition of international sanctions against Iran in exchange for restrictions to its nuclear program.

The negotiations between major powers and Tehran are now in a delicate, closing stage and the new development from Congress introduced a new factor of uncertainty. John Kerry, the U.S. Secretary of State, sought to bolster the spirit of the day, expressing he was “confident” an agreement would be concluded. He was at a Group of Seven meeting of foreign ministers in Germany.

With the new bill from Capitol Hill, Obama is now required to send any final deal reached with Tehran to Congress. It also and inhibits Obama’s capacity to put off many of the United States’ sanctions against Iran during the time Congress is reviewing the agreement. The new law also allows for the possibility of a vote on whether to dispose of the sanctions Congress implemented.

Although Iran insists that its nuclear program is only for civilian purposes, it has also never invited verification, which would mean, in part, invasive inspections on its soil. The nation had kept some of its nuclear sites secret in the past.