Congressional Democrats are demanding that the Trump administration immediately reverse a sanctions waiver allowing Indian refiners to purchase Russian oil as the Iran war wreaks havoc on global energy markets.

“Your recent decision to provide a 30-day waiver is dangerous, self-defeating, and indefensible,” Rep. Sam Liccardo, D-Calif., and Sen. Ruben Gallego, D-Ariz., wrote in a letter to Treasury Secretary Scott Bessent, which was shared exclusively with CNBC. “This waiver constitutes an inexplicable act of material benefit to the enemy.”

The Treasury Department last week issued a temporary 30-day sanctions carveout to allow India to buy Russian oil, an effort to ease skyrocketing oil prices caused by the war and the traffic standstill at the Strait of Hormuz.

The oil surge comes less than eight months before the November midterm elections that could flip the House of Representatives and the Senate to Democratic control, and polls show voters are souring on President Donald Trump’s handling of the economy.

After the sanctions waiver was issued, however, it was reported that Russia is assisting Iran in targeting U.S. ships, aircraft, and bases in the region. Gallego and Liccardo warned in the letter against the temporary lifting of the sanctions, which rewards Russia with a windfall as it helps to target U.S. troops in the Middle East.