Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Trump's Options Limited in Slapping Iran With New 'Punishing' Sanctions Masood Farivar U.S. President Donald Trump announced on Wednesday that the United States would immediately impose "punishing" additional sanctions on Iran, a day after Iran fired missiles on two Iraqi bases with American personnel in retaliation for the U.S. killing of top Iranian general Qassem Soleimani. "These sanctions will remain until Iran changes its behavior," Trump said during a televised speech from the White House. But with Iran already under a crippling sanctions regime that costs it billions of dollars a year, the question is, what additional penalties can the administration impose on Tehran? "Well, that's a very good question because every sector of the Iranian economy is very thoroughly sanctioned right now," said Kenneth Katzman, the lead Iran analyst at the nonpartisan Congressional Research Service. "So I think experts including myself are wondering what more can be done, because really there is not a lot of ground to plow beyond what's already been done." .