The Environmental Protection Agency and Democratic Sen. Tom Carper sparred Tuesday over whether the EPA awarded its fair share of climate change grants to states after reports suggested the agency had been cutting its grant program.

The fight began after Carper, the top Democrat on the Environment and Public Works Committee, sent a letter to EPA Administrator Scott Pruitt on Tuesday as a follow-up to one he sent in the summer, informing Pruitt that an analysis done by Carper’s staff suggests Pruitt is not awarding the grants, despite congressional appropriations to do so.