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Republicans are putting the Natural Resources Defense Council (NRDC) under the microscope as they comb through the green group’s communications with federal regulators.

For the NRDC, the investigation highlights how its stature has risen in Washington, to the point where it is seen as one of the heaviest hitters — and biggest targets — in the environmental movement.

Republicans say the group has been pulling the strings as the Environmental Protection Agency (EPA) crafts sweeping rules aimed at reducing climate change.