Presidential candidate Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) on Monday took aim at President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick 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.'"

.@realDonaldTrump



Trump awaits instructions from his Saudi masters. Having our country act as Saudi Arabia's bitch is not "America First." https://t.co/kJOCpqwaQS — Tulsi Gabbard (@TulsiGabbard) September 16, 2019

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize 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.