Not that Nixon was any sort of Republican to write home about anyway.
Scripps Howard reports in “GOP attacks on EPA — what’s behind them?“,
… The GOP attacks are ironic given that the EPA was created during a Republican administration — under President Richard Nixon in December 1970 — and charged with comprehensively regulating environmental pollutants…
Nixon created the EPA by executive order in 1970 as a sop to the anti-Vietanm war left — not because he thought an EPA was needed.
Nixon reassigned to the EPA the ongoing environmental protection activities of other federal agencies.
So Nixon’s move was little more than a cynical bureaucratic reshuffling done to facilitate his Vietnam policies — not some proud legacy of the Republican party.