Washington DC - Representative Ro Khanna has called for an end to the Donald Trump administration's war on Iran ahead of the upcoming midterm elections.

"We must work to end the war in Iran before the midterm elections, or I fear this will become another endless war," Khanna said in a video message on Friday.

"Right now, all of the political incentives are there to bring this war to an end," the California Democrat continued, citing high food and gas prices.

He warned, "If we don't end this war now, then there will not be the same political pressure to bring it to a close."

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Trump has sought to downplay the significance of the war which has left thousands of people dead, on Friday calling it "small potatoes" for the US.

After multiple efforts, both the House and Senate passed resolutions aimed at curbing Trump's authority to wage war on Iran without congressional approval. His administration considers such measures not legally binding.

Khanna said he had reached out to Representative Thomas Massie and other Republicans, saying it was time to "form an unconventional coalition" to end the war.

"If you believe that we need to be for America first, if you voted for Trump on the promise of no new wars, then please, let us work together to bring a ceasefire to the war in Iran, to have diplomacy and negotiation, and prevent America from getting into another forever war in the Middle East," the representative urged.

American voters hit the polls on November 3 for midterm elections that will determine which party controls each chamber of Congress.