Treasury Secretary Steven Mnuchin does not make the news as often as some of his colleagues in the Trump administration, but that could change if a Freedom of Information Act lawsuit forces open new revelations about Russian collusion with U.S. environmental activists.

The Institute for Energy Research, a nonprofit free-market group based in Washington, D.C., filed suit on Wednesday against the Treasury Department after the agency failed to respond to a FOIA request filed in October asking for records that involve allegations of Russian financial support for U.S. environmental groups. This is part of a one-two punch that began Monday with a FOIA lawsuit IER filed against the State Department that also inquired into Russian financial support for U.S. green groups. The FOIA request to the State Department was filed in October.