Larijani made the remarks Sunday in reaction to claims made that JCPOA has been accepted in short time.
Majlis voted all decisions regarding Iran Deal, he said.
The US administration has done a great deal during past year to kill Iran nuclear deal.
Trump is expected to announce his decision on whether or not to stay in the JCPOA on May 12.
This is while; the International Atomic Energy Agency (IAEA) has already confirmed ten times Iran's commitment to the landmark July 2015 international deal.
