President Donald Trump, with two months left in office, last week asked for options on attacking Iran’s main nuclear site, but ultimately decided against taking the dramatic step, a US official said on Monday. Trump made the request during an Oval Office meeting on Thursday with his top national security aides, including Vice President Mike Pence, Secretary of State Mike Pompeo, new acting Defense Secretary Christopher Miller and General Mark Milley, chairman of the Joint Chiefs of Staff, the official said. Trump, who has refused to concede and is challenging the results of the Nov. 3 presidential election, is to hand over power to Democratic President-elect Joe Biden on Jan. 20. The official confirmed the account of the meeting in The New York Times, which reported the advisers persuaded Trump not to go ahead with a strike because of the risk of a broader conflict. “He asked for options. They gave him the scenarios and he ultimately decided not to go forward,” the official said. The White House declined comment. Trump has spent all four years of his presidency engaging in an aggressive policy against Iran, withdrawing in 2018 from the Iran nuclear deal negotiated by his Democratic predecessor, Barack Obama, and imposing economic sanctions against a wide variety of Iranian targets. Trump’s request for options came a day after a U.N. watchdog report showed Iran had finished moving a first cascade of advanced centrifuges from an above-ground plant at its main uranium enrichment site to an underground one, in a fresh breach of its 2015 nuclear deal with major powers.