Gabbard warns Trump: Acting like 'Saudi Arabia's b---- is not "America First"'

Presidential candidate Rep. Tulsi GabbardTulsi Gabbard'We lost a giant': 2020 Democrats mourn the death of Elijah Cummings Third-quarter fundraising sets Sanders, Warren, Buttigieg apart Poll: Almost half of voters say debates are best gauge of candidate's standing MORE (D-Hawaii) on Monday took aim at President TrumpDonald John TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' MORE after he said the U.S. is "locked and loaded" and "waiting to hear from the Kingdom" after drone attacks on Saudi Arabia's oil supply over the weekend.

"Trump awaits instructions from his Saudi masters," she tweeted. "Having our country act as Saudi Arabia's bitch is not 'America First.'"

Secretary of State Mike PompeoMichael (Mike) Richard PompeoTrump touts Turkey cease-fire: 'Sometimes you have to let them fight' Pompeo to meet Netanyahu as US alliances questioned Washington indecision compounded the Kurds' dilemma MORE has publicly blamed Iran for what he described as an “unprecedented attack on the world’s energy supply,” disputing the presence of evidence suggesting the attacks came from Yemen.

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Tehran has denied involvement in the attacks, which have been claimed by Iran-backed Houthi rebels in Yemen, who are also threatening further strikes.

The Saudi-led military coalition said Monday that preliminary evidence points toward the weapons used in the attack being Iranian.

Gabbard, a member of the Hawaii National Guard who served in Iraq, has used the "Saudi Arabia's bitch" insult against Trump before, calling him out in November for defending the nation following the slaying of U.S.-based journalist Jamal Khashoggi.

She has been an outspoken opponent of U.S. military intervention in conflicts surrounding regime change.