A bipartisan group of lawmakers led by Sens. Joni Ernst, R-Iowa, and Richard Blumenthal, D-Conn., penned a letter to President Biden demanding he resolve a delay regarding the transfer of thousands of barrels of oil from a seized Iranian oil tanker.

"For months, I have called on President Biden to stand up to Iran and enforce our sanctions and laws," Ernst told Fox News Digital. "Instead, he has doubled down on his posture of appeasement, emboldening the IRGC (Islamic Revolutionary Guard Corps) to intimidate American companies in our own waters. This is unacceptable. The Biden administration must reverse their weak posture, so Americans know their lives and livelihoods will be protected against terrorists’ intimidation attempts."

At issue is the case of the Suez Rajan oil tanker, which was seized off the coast of Galveston, Texas, in May. However, fears of Iranian retaliation if the cargo were to be transferred off the tanker have delayed the offloading, according to a report from Reuters. A senior commander of Iran's Revolutionary Guard's navy warned last month that the country would retaliate against any oil company that unloads Iranian oil from the seized tankers, continuing a monthlong trend of in which multiple vessels have been seized by Iran in the Strait of Hormuz and Gulf of Oman.

US SENDS F-16 FIGHTERS TO PERSIAN GULF TO FEND OFF IRANIAN SHIP SEIZURES

President Joe Biden

President Biden. (Demetrius Freeman/The Washington Post via Getty Images)

However, the group of 10 bipartisan lawmakers argued continued delays risk making current oil sanctions against Iran "irrelevant."

"No American citizen or company should ever fear retaliation from an FTO for assisting in lawful law enforcement activities or engaging in lawful commerce," the letter to Biden reads. "The enforcement of petroleum sanctions will become irrelevant if American citizens and companies involved constantly live in fear of Iranian retaliation. It is imperative that your administration make it clear that Iran and designated Foreign Terrorist Organizations will not be able to prevent our government from carrying out legitimate law enforcement operations."

Iran military parade

An Iranian military truck carries surface-to-air missiles past a portrait of Iran's Supreme Leader Ayatollah Ali Khamenei during a parade on the occasion of the country's annual army day on April 18, 2018, in Tehran, Iran. President Hassan Rouhani said that Iran "does not intend any aggression" against its neighbors but will continue to produce all the weapons it needs for its defense. (Photo by ATTA KENARE/AFP via Getty Images)

The Suez Rajan is currently carrying 800,000 barrels of oil with an estimated value of $56 million. Any sale of the seized assets would result in 75% of the proceeds being deposited to the U.S. Victims of State-Sponsored Terrorism Fund (USVSST), which is used to compensate victims and survivors of terrorism.

Joni Ernst

Sen. Joni Ernst (R-IA). (Chip Somodevilla/Getty Images)

IRAN NOT DEVELOPING NUCLEAR WARHEAD SAYS US INTELLIGENCE

In the letter, the lawmakers noted that there are currently "insufficient assets" to authorize another round of payments from the fund in 2024, something the sale of the seized Iranian oil could help resolve.

"Once seized, these assets would further close the gap between committed and available resources for the USVSST fund," the letter read. "Once seized, these assets would further close the gap between committed and available resources for the USVSST fund."

The bipartisan group included lawmakers from both he House and the Senate, with Rep. Elise Stefanik, R-N.Y. leading the effort in the House. Stefanik told Fox News Digital that continued delays amid Iranian threats will only serve to embolden Iran.

Stefanik at press conference after Trump says he is a target in the Jack Smith Jan. 6 probe

House Republican Conference Chair Rep. Elise Stefanik (R-NY). (Anna Moneymaker/Getty Images)

CLICK HERE TO GET THE FOX NEWS APP

"Iran’s ramped-up threats and attacks against Western ships are the direct result of the Biden Administration pandering to Tehran by prioritizing a flawed nuclear agreement instead of protecting America’s national security," Stefanik said. "Recent reports allege that Iran is threatening to retaliate against U.S. civilians and corporations if they engage in the unloading of seized Iranian oil. This unacceptable behavior shows the Biden Administration’s continued weakness on the world stage is only emboldening Iran."

The White House referred a Fox News request for comment to the Justice Department, which declined to comment.