The Iranian Revolutionary Guard Corps (IRGC) has hinted that it would close the Strait of Hormuz if Iran is prevented from using it, in what appeared to be the first response to the US plan to end waivers on Iranian oil exports. "If Iran’s benefits in the Strait of Hormuz, which according to international rules is an international waterway, are denied, we will close it,” IRGC Navy Commander Rear Admiral Alireza Tangsiri said after the Trump administration revealed Monday that it will no longer exempt any countries from US sanctions if they continue to buy Iranian oil. Iran has previously threatened to close the strait. “Dont play with fire, or you will regret,”  Iranian President Rouhani cautioned Trump last July. Rouhani said that the Americans should come to realize that establishing peace with Iran is the mother of all peace and waging war with the country is the mother of all wars. At the same time, Iran’s Supreme Leader Ali Khamenei agreed that Rouhani’s threats to close the international waterway expressed the regime’s policy. Khamenei replaced chief commander of IRGC Mohammad Ali Jafari with Brigadier General Hossein Salami, seven days after the US designated the group a foreign terrorist organization. Tangsiri added that replacing the IRGC commander-in-chief had nothing to do with Washington’s recent decision. However, Iranian Armed Forces spokesman Brigadier-General Abu al-Fadl Shakarji said Monday that Salami’s appointment is a blow to the US. The Iranian foreign ministry said Iran was in "constant talks with its international partners including the Europeans" on Washington’s ending of the exemptions. It added that an “important decision" will be announced later, without elaborating. China, India, North Korea, Japan, Taiwan, Italy, and Greece will face US sanctions starting May in case they continue to purchase Iranian oil. In November, Washington reimposed strict economic sanctions against Tehran and all states that don’t abide by them, after its withdrawal from the 2015 nuclear deal.