Tehran, Iran ? Defiant lawmakers, shouting “Death to America,” unanimously voted Sunday to approve the outline of a bill requiring the government to resume uranium enrichment, a move likely to deepen an international dispute over Tehran’s atomic activities.

Nevertheless, Iran’s top nuclear negotiator, Hossein Mousavian, told The Associated Press in an exclusive interview that a compromise still could be reached with European negotiators to avert the risk of U.N. sanctions.

Britain, France and Germany have offered Iran a trade deal and peaceful nuclear technology, including a light-water research reactor, in return for assurances Iran would indefinitely stop enriching uranium. Uranium enriched to a low level can be used to produce nuclear fuel, but if enriched further it can be used to make nuclear weapons.

While lawmakers were discussing the bill, Mousavian ruled out an indefinite suspension of enrichment activities. But he suggested Iran would consider halting the building of more nuclear facilities, which it would need to produce enough fuel for additional power plants.

Washington has accused Iran of trying to build atomic weapons and has pushed for the case to be referred to the U.N. Security Council for possible sanctions if Tehran doesn’t give up all uranium enrichment activities before a Nov. 25 meeting of the International Atomic Energy Agency, the U.N.’s nuclear watchdog.

“I see the chance of a compromise before November as 50-50,” Mousavian told the AP.

“We have rejected two possibilities: cessation and unlimited suspension,” he said. “We told the Europeans if your target is cessation, it will be impossible. But we are flexible if your proposal is balanced.”

Tehran maintains its nuclear program is for peaceful energy purposes.

Mousavian said some progress was “definitely” made during Iran’s talks last week with Europeans, who he said “showed flexibility and understanding.”

However, those negotiations could be hampered if Iran’s government obliges calls by lawmakers to push ahead with enrichment.

Parliament speaker Gholam Ali Haddad Adel said Sunday’s vote by the conservative-dominated parliament in favor of the outline of a bill that forces their government to resume uranium enrichment sent a message to the world.

“The message of the absolute vote for the Iranian nation is that the parliament supports national interests,” he said. “And the message for the outside world is that the parliament won’t give in to coercion.”