Mark Dubowitz, of the Foundation for the Defense of Democracies, a think tank that advocates tougher sanctions against Tehran, predicted harsher penalties.
"There will be a lot of sanctions activity" from both the executive and legislative branches, he said.
Legislation that had been dormant in the House and Senate would now likely pass, Mr. Dubowitz said, but he added that more sanctions would not be enough.
"We have been in a sanctions sleepwalk with Iran," he said. "We have to move beyond that to a more forceful response. How about using drones to take out some of those" linked to the plot, or to Iran's activities aiding insurgents fighting U.S. forces in Iraq or Afghanistan? he asked.
"The Iranians are clearly at the point where they feel they can act with impunity," he said.
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