Iran’s top political chamber gave final approval to a bill forcing President Hassan Rouhani to end international nuclear inspections unless the U.S. lifts key sanctions by February, giving the incoming Biden administration just weeks to make a diplomatic breakthrough.

The new legislation also says that Iran will immediately take measures to start producing 20% enriched uranium for peaceful purposes and increase its stockpile of the fissile material, potentially reducing the time Iran needs to make preparations to acquire a weapon.

The powerful Guardian Council, a political and legal body made up of senior clerics and scholars, ratified the bill on Wednesday and made it a legal requirement, while extending the deadline for sanctions relief to two months, instead of one, Iranian state TV reported.