The UN banned Iran from buying major foreign weapons systems in 2010 amid tension over its nuclear programme.
"The U.S. will introduce a resolution this week to extend the embargo after years of diplomacy", Pompeo wrote on Twitter.
The U.N. Security Council is preparing to vote this week on a USA proposal to extend an arms embargo on Iran, a move that some diplomats say is bound to fail and put the fate of a nuclear deal between Tehran and world powers further at risk. And if the vote fails Friday, a US official says the administration would inform the Security Council next week that it intends to trigger the snapback process.
One provision in the original resolution would have authorised all United Nations member states to inspect cargo either originating or destined for Iran when entering or transiting through their territory at airports, seaports, or free trade zones, if the member state had "reasonable grounds to believe the cargo" contained banned items. An earlier embargo targeted Iranian arms exports. Iran also is suspected of launching a September attack on the heart of Saudi Arabia's oil industry, though Tehran denies that. However, that move may cause more friction with USA allies who continue to support the 2015 Iran nuclear deal and objected to Trump's withdrawal from it in 2018.
Tehran has repeatedly insisted it has no interest or intention to produce a nuclear bomb.
The embargo is expected to expire in October under UN Resolution 2231 and the Iran nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA).
U.S. Special Representative for Iran Brian Hook alluded to the United States wanting to reimpose all U.N. sanctions when he said last week, "We need to restore the U.N. Security Council standard of no enrichment". The council is operating virtually so once a vote is called, members would have 24 hours to submit their response.
If the resolution is defeated, US Secretary of State Mike Pompeo suggested Washington would invoke the "snapback" mechanism in the 2015 nuclear deal that would restore all United Nations sanctions on Iran.
Russian Foreign Minister Sergey Lavrov accused the Trump administration of waging a politically motivated campaign against Iran and called for "universal condemnation" of the USA attempt to impose a permanent arms embargo on the Islamic Republic.
"Since the United States left the 2015 Iranian nuclear deal, the US' three European allies have also made it clear that Washington cannot trigger the dispute resolution mechanism that could lead to the restoration of UN to ban on Iran", Zarif said, according to the official IRNA news agency.
Chinese Foreign Minister Wang Yi said the arms embargo should be lifted October 18.
"When we win, we will have a deal within four weeks", he said in leaked footage from a fundraiser on Sunday at the New Jersey home of Syrian-Jewish leader Stanley Chera, a real estate developer and friend of the president who died in April at the age of 77 due to complications from coronavirus.
The five remaining signatories to the 2015 deal - Russia, China, Britain, France and Germany - remain committed to the agreement.