"You keep circling back to the same statements, many or which are unsupported conjectures on your part," Bergstresser later wrote to Kozora. "If you have nothing new to bring up, please stop emailing me about this topic," Bergstresser wrote.
"I am also now utterly confused as to what the purpose of the proposed DOL rule is then, if not to limit advisor conflicts when providing retirement advice," Kozora later wrote.
Bergstresser and Kozora could not be immediately reached for comment.
The Labor Department "prioritized the expeditious completion of the rulemaking process at the expense of thoughtful deliberation," the report said.
Individual retirement accounts accounted for $7.3 trillion, of U.S. retirement assets in September, according to trade group Investment Company Institute.