U.S. lawmaker Tulsi Gabbard says she’s “skeptical” that the Syrian government was behind the chemical weapons attack that killed dozens of people in Syria.

Gabbard's remarks came after U.S. President Donald Trump said, “There can be no dispute that Syria used banned chemical weapons.”

U.S. Secretary of State Rex Tillerson also claimed that Washington has a very high level of confidence that the attacks were carried out “by aircraft under the direction of the Bashar a-Assad regime.”

Following the alleged chemical weapons attacks, the U.S. fired almost 60 cruise missiles at an airfield of the Syrian army, saying that the airfield was used to conduct the attacks.

Mentioning the previous invasion of Iraq that was based on false information that Iraq had weapons of mass destruction, Gabbard said, “So, yes, I'm skeptical.”

“Why should we just blindly follow this escalation of a counterproductive regime-change war?” she said.

“I have not seen that independent investigation occur and that proof presented showing exactly what happened and there are a number of theories of exactly what happened that day.”

Gabbard, a Democratic lawmaker representing Hawaii's 2nd congressional district, faced criticism after making an unannounced trip to Syria, where she met with Assad.

She opposes U.S.-led regime-change wars and has opposed removal of Bashar al-Assad from power, arguing that U.S. regime-change intervention in Syria’s civil war is a source of the Syrian refugee crisis.