Senate Democrats are demanding that the Trump administration explain its ties to GOP mega-donor brothers Charles and David Koch after the brothers' network took credit for some policies passed during President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s first year in office, McClatchy reported.

The letters come after a report was sent to a group of Koch donors called the Seminar Network that took responsibility for roughly a dozen new policies passed by the Trump administration, including the new GOP tax law and the repeal of the Obama-era Clean Power Plan.

“Americans have a right to know if special interests are unduly influencing public policy decisions that have profound implications for public health, the environment, and the economy,” the senators write in their letters obtained by McClatchy.

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The letters were sent to administration officials including President Trump, Environmental Protection Agency Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention MORE and Interior Secretary Ryan Zinke Ryan Keith ZinkeTrump extends Florida offshore drilling pause, expands it to Georgia, South Carolina Conspicuous by their absence from the Republican Convention Trump flails as audience dwindles and ratings plummet MORE.

A spokesman for the Koch network told McClatchy that the network is transparent about the efforts it backs and that they’ll “work with anyone to make progress on these issues.”

“This is emblematic of whats wrong with Washington. People playing political games rather than coming together and solving issues,” the spokesperson said.

The White House did not respond to McClatchy’s request for comment.

The Kochs did not back Trump during the 2016 presidential race but have supported top Trump administration officials, including Vice President Pence and Pruitt.

White House counselor Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE, White House counsel Don McGahn and legislative affairs director Marc Short all previously worked for the Koch network.