“This is a dangerous, high-tension situation that requires a strong, smart and strategic approach,” Pelosi said in the release.
She also noted that congressional leaders have stressed during Thursday's meeting with Trump that the United States should work with its allies and not strengthen the hand of Iran's hardliners by its actions.
Democrats have also emphasised that any military action against Iran must first receive congressional approval.
"We have no illusions about the dangerous conduct of the Iranian regime," Pelosi said.
Speaking about preparations of the strike targeting Iran, Pelosi stated that she wasn't provided with any advance notification on these plans. Prior to her statement, Donald Trump announced that he had "stopped" a military strike against three sites in Iran after learning that some 150 people would die in the attack.
Earlier, Iran’s Ambassador to the United Nations Majid Takht Ravanchi said in a letter to UN Secretary-General Antonio Guterres seen by Sputnik that Tehran urges the international community to call on the United States to end its unlawful and destabilising measures in the Persian Gulf.
The situation escalated after the Islamic Revolution Guards Corps said on Thursday that they shot down a US surveillance drone because it violated Iran’s airspace - an assertion denied by Washington.
Trump initially said Iran made "a very big mistake," but later told reporters he doubted the downing of the drone was intentional. Some US lawmakers, however, have called for taking action against Iran over the incident.