"They explained to us how the Iranian threat streams were different than in the past, that the attack on the ships and the pipeline was co-ordinated and directed by the Iranian government, the ayatollah", Mr Graham told reporters. "And that's what's extremely important".
"I just hope Iran is listening", he said about whether Iran was getting the message.
He said the U.S. sanctions, which have hit the Iranian economy hard, "amounts to terrorism" on the country's citizens.
Members of the US Congress remain split over the threat of Iran in the region after being told during a day of closed-door briefings in Washington that US President Donald Trump is tamping down talk of war.
On Tuesday, senior US officials, including Secretary of State Mike Pompeo, Chairman of the Joint Chiefs of Staff General Joseph Dunford and Shanahan, held the briefing at the Congress, informing the lawmakers about recent developments concerning Iran.
"There haven't been any attacks on Americans". "I'd say we're in a period where the threat remains high and our job is to make sure that there is no miscalculation by the Iranians", Shanahan added. "We're in the region to address many things, but it is not to go to war with Iran". "I think our response was a measure of our will and our resolve that we will protect our people and our interests in the region", he said.
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Iran's Revolutionary Guard Corps, or IRGC, was recently designated as a foreign terrorist organization by the Trump administration, the first ever designation of an entire foreign military.
This month, officials in the United Arab Emirates also alleged that four oil tankers were sabotaged; Iran-backed rebels launched a drone attack on an oil pipeline in Saudi Arabia; and U.S. diplomats relayed a warning that commercial airlines could be misidentified by Iran and attacked, an idea dismissed by Tehran.
President Donald Trump told reporters that there are no signs Iran is preparing actions against United States interests in the Middle East, adding that any provocation by Tehran will be met "with great force". "They're echoing talking points against President Trump that they're getting from Iran's Foreign Minister Zarif".
Democrats and Republicans are divided over the Trump administration's explanation of its heightened military response towards Iran.
The researcher continued that the regime is now under huge pressure and Iranians will eventually realize that they do not have time to wait, because they may end up with the re-election of Trump for a second term.
The Iranian statement is a direct challenge to the U.S., which has slapped more sanctions on the Shia state over its nuclear programme.