'We continually evaluate our force posture in the region, ' he continued.
Tensions between the two countries worsened last month when the Trump administration ordered the deployment of an aircraft carrier strike group, bombers and Patriot missiles to the Middle East, citing intelligence about possible Iranian preparations to attack U.S. forces or interests.
"This would continue to have a very chilling effect on the prospects for any future recovery for the Iranian economy", one official told Reuters, saying the petroleum and petrochemical industries "have been serving for the last 40 years as a kind of institutionalized slush fund for the IRGC".
The Pentagon has also accused the IRGC of being directly responsible for May 12 attacks off the United Arab Emirates coast that damaged two Saudi tankers, an Emirati vessel and a Norwegian tanker.
Details of the alleged sabotage remain hazy and Tehran has denied responsibility.
In Baghdad, McKenzie told reporters from The Associated Press and two other media organizations that USA redeployments to the Gulf have "caused the Iranians to back up a little bit, but I'm not sure they are strategically backing down".
Among the threats the USA military is now tracking, officials have said, are possible missile attacks by Iranian sailing vessels, called dhows, in the Gulf and region; attacks in Iraq by Iranian-trained militia groups; and attacks against U.S. ships and against Saudi Arabia by Houthi rebels in Yemen.
'I don't actually believe the threat has diminished, ' McKenzie said after following a series of meetings with the Iraqi Prime Minister Adil Abdul-Mahdi and Iraqi defense chief.
"They probe for weakness all the times", McKenzie said.
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He declined to go into specifics of the nature of the threats.
President Trump ratcheted up pressure on Tehran last week; deploying an additional United States aircraft carrier to the Persian Gulf after intelligence reports showed Iran was planning attacks on American interests in the region.
Tensions between the two countries worsened last month when the administration of US President Donald Trump ordered the deployment of an aircraft carrier strike group, bombers and Patriot missiles to the Middle East, citing intelligence about possible Iranian preparations to attack US forces or interests.
The remarks come a year after Washington pulled out of a deal between Iran and global powers to curb Tehran's nuclear programme in return for lifting worldwide sanctions.
Iran claims its nuclear program is strictly for civilian purposes.
"I think we're still in the period of what I would call tactical warning", he said.
"When I became president, Iran was a true state of terror". They still are and were undisputed champions of terror.
"We're working very hard to walk that line".
McKenzie, a veteran of combat in Iraq and Afghanistan, took command of Central Command in late March, shortly before the onset of the latest surge in tensions with Iran.
"They are failing as a nation, but I don't want them to fail as a nation". Dunford said that on May 3, the USA sent a message to Iranian officials "just to make it clear they understood that we would hold them accountable should something take place in the region".