House Science Committee Chairman Lamar Smith, R-Texas, opened another front in a war with federal climate researchers Wednesday, saying a groundbreaking global warming study was “rushed to publication” over the objections of numerous scientists at the National Oceanic and Atmospheric Administration.

In a second letter in less than a week to Commerce Secretary Penny Pritzker, Smith urged her to pressure NOAA to comply with his subpoena for internal communications. Smith says whistleblowers have come forward with new information on the climate study’s path to publication in June.

The study refuted claims that global warming had “paused” or slowed over the past decade, undercutting a popular argument used by those who refute the scientific consensus that man-made pollution is behind global warming.

The research, considered a bombshell in the climate change debate, set off alarms among skeptics. Smith, a prominent skeptic in Congress, claimed that scientists manipulated data to advance President Obama’s agenda and timed the study’s release to coincide with the administration’s new limits on emissions from coal plants.

He is seeking NOAA’s internal communications and emails among its researchers, and in October subpoenaed Administrator Kathryn Sullivan for the documents. She has refused to turn them over, saying that deliberative communications between scientists should be protected.

Smith told Pritzker that the whistleblowers’ allegations make it more crucial that he be provided with the scientists’ internal emails and communications. If NOAA does not produce the emails he is seeking by Friday, the chairman said, “I will be forced to consider use of compulsory process,” a threat to subpoena the commerce secretary herself.