Congressional efforts to update the president’s ability to battle terrorist groups are running into resistance from Democrats and anti-war groups worried about the Donald Trump administration’s hawkish turn.

While lawmakers of both parties have long sought to update the 2001 law that has served as the legal underpinning for war on terrorism operations around the globe, critics worry the latest effort inadvertently increases rather than limits the president’s military powers. Some even argue that the bill from Senate Foreign Relations Committee Chairman Bob Corker, R-Tenn., and Sen. Tim Kaine, D-Va., could even be used to justify attacking Iran.

At a hearing this week, the committee’s top Democrat, Sen. Robert Menendez of New Jersey, said the new authorization for the use of military force could allow Trump to “start a war with Iran.”

The May 8 White House statement withdrawing the United States from the Iran nuclear deal, Menendez pointed out, “stated that the Taliban and al-Qaeda were proxies of Iran. If in fact [Trump] says that the Taliban and al-Qaeda are proxies of Iran and wants to pursue those or any other entities in another country, there is no provision that stops him from pursuing those entities in another country.”