The administration has vowed to continue challenging Iran’s terrorist activities and support of militancy, even after a nuclear deal is completed.

But the fresh sanctions push has the potential to put the White House and leading Democrats, such as the party’s presidential front-runner Hillary Clinton, in a quandary. Those supporters of the deal could later face a tough decision over whether to back increased sanctions against Iran.

There is growing concern in the White House that any steps viewed as imposing new sanctions could be seized on by the Iranian government to charge the U.S. with violating the nuclear agreement. Already, Iranian officials have argued Congress is seeking to simply reimpose these financial restrictions under the guise of fighting terrorism and human-rights abuses. Tehran’s position could be backed by Russia, China and the European Union—the other parties to the nuclear deal.