A legal filing from Citibank may shine light on the Trump administration’s anti-climate crusade, with the bank saying it was informed that the EPA’s Greenhouse Gas Reduction Fund was under an active criminal investigation.

Citibank revealed in court filings on Wednesday that the FBI, the EPA, the EPA inspector general, and the Treasury Department have all requested that the bank freeze accounts of several nonprofits and state government agencies.

An environmental nonprofit sued the U.S. Environmental Protection Agency and Citibank on Saturday, seeking billions of dollars for solar and other projects frozen by the bank as the Trump administration slashes federal spending.

The lawsuit filed Monday claims that the bank is preventing the nonprofit from abiding by its contract with the federal government.

On Wednesday, a ranking member of the Senate Environment and Public Works Committee accused the Environmental Protection Agency (EPA) of "misusing law enforcement" to claw back climate funds and "humor" Donald Trump’s "vindictive political whims.

A U.S. judge on Wednesday pressed President Donald Trump's administration for evidence of fraud, waste and abuse in a $20 billion climate funding program that the administration has moved to terminate.