US President Donald Trump said on Monday that it looked like Iran was responsible for attacks over the weekend on Saudi Arabian oil plants.
Earlier, he said the United States was “locked and loaded” to hit back after Saturday’s attack.
Members of the US Congress blasted Iran.
“Iran continues to respond to diplomacy with violence and demonstrate the regime’s refusal to act as a responsible member of the international community,” Senator Jim Risch, the Republican chairman of the Foreign Relations Committee, said in a statement.
He warned of US retaliation in case of an attack on US troops.
“Iran should not underestimate the United States’ resolve,” he said. “Any attack against US forces deployed abroad must be met with an overwhelming response - no targets are off the table.”
US Senate Majority Leader Mitch McConnell blamed Iran for the attack and called for an international response.
"I hope our international partners will join us in imposing consequences on Iran for this reckless, destabilizing attack," McConnell, a Republican, said as he opened the US Senate.