DUBAI/WASHINGTON (Reuters) – U.S. President Donald Trump said on Saturday he would impose fresh sanctions on Iran but that he wanted to make a deal to bolster its flagging economy, an apparent move to defuse tensions following the shooting down of an unmanned U.S. drone this week by the Islamic Republic. On Thursday, an Iranian missile destroyed a U.S. Global Hawk surveillance drone, an incident that Washington said happened in international airspace. Trump later said he had called off a military strike to retaliate because it could have killed 150 people. Tehran repeated on Saturday that the drone was shot down over its territory and said it would respond firmly to any U.S. threat .Speaking in Washington on Saturday before heading to the U.S. presidential retreat at Camp David, Trump indicated the government was taking a diplomatic path to put pressure on Tehran by moving to impose new sanctions.Military action was “always on the table,” the president said, but he added that he was open to quickly reaching a deal with Iran that he said would bolster the country’s flagging economy. “We will call it ‘Let’s make Iran great again,’” Trump said. He later wrote on Twitter from Camp David: “We are putting major additional Sanctions on Iran on Monday. I look forward to the day that Sanctions come off Iran, and they become a productive and prosperous nation again.” The Trump administration has sought to use promises of economic revival to solve other thorny foreign policy challenges, including the Israel-Palestinian peace process, with the White House outlining on Saturday a plan to create a global investment fund to lift the Palestinian and neighboring Arab state economies.