Whistleblowers have informed top Republican senators that former President Barack Obama’s State Department blocked the FBI from executing arrest warrants against illegal aliens in the U.S. who were financially backing Iran’s efforts to develop weapons of mass destruction.

Sens. Chuck Grassley (R-IA) and Ron Johnson (R-WI) said that for nearly 20 years, Republican and Democrat administrations imposed sanctions on “Iranian individuals, companies, and organizations for involvement in nuclear proliferation, ballistic missile development, support for terrorist groups, and human rights abuses.”

They noted that even one of Obama’s executive orders and a law passed during the Obama-era, the Iran Nuclear Agreement Review Act of 2015, were created to hold Iran accountable.

However, whistleblowers informed the senators that while the Obama-Biden administration publicly committed to “prevent[ing] Iran from acquiring nuclear weapons by raising the cost of Iran’s defiance of the international community,” former Secretary of State John Kerry worked to undermine those efforts.

“Kerry actively interfered with the Federal Bureau of Investigation (FBI) executing arrest warrants on individuals in the U.S. illegally supporting Iranian efforts, including financial efforts, to develop weapons of mass destruction (WMD) and its ballistic missile program,” the letter said. “The records show that Justice Department and FBI leadership, to include then-Attorney General Lynch and then-FBI Director Comey, failed to take the necessary steps to stop Kerry’s obstructive efforts against law enforcement.”

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The letter continued:

For example, unclassified FBI email records from August 25, 2017, detailed at least eight instances connected to the Iran deal where the “FBI/DOJ/USG could have moved forward with the cases but the State Department chose to block them.” According to the records, in six of these instances, the FBI lost the opportunity to arrest the main subject. The email says that one of the lost main subjects was noted to be “on the Terrorism Watch List” and another “returned to Iran.” The email further says that in another instance the State Department “blocked [FBI’s] plan to arrest while the subject was mid-flight and the subject was forced to leave the US immediately upon arrival.” The email also provides that at least two targets were arrested only after “State lifted their block…since the new [Trump] Administration took office.”

The letter said that these efforts to obstruct law enforcement were done “due to political reasons,” the letter said.

The letter said that Kerry’s efforts to obstruct law enforcement became such an issue that then-Attorney General Loretta Lynch had to meet with Kerry about the matter.

“The records provided to our offices show that the Obama/Biden administration’s State Department, under the leadership of John Kerry, actively and persistently interfered with FBI operations pertaining to lawful arrests of known terrorists, members of Iranian proliferation networks, and other criminals providing material support for Iran’s nuclear and ballistic missile programs,” the letter said. “The records also show that DOJ and FBI leadership apparently allowed it to happen until the Trump administration altered course.”

Related: Obama Helped Hezbollah To Secure Bogus Iran Deal. Here Are The Key Takeaways From Politico’s Report.