Several other lawmakers have blasted Genachowski for pushing the rules forward, however.

Genachowski's proposal is in "direct contradiction" to testimony he made in March before a House committee, said Representative Mike Rogers, a Michigan Republican. Genachowski said then he was not in favor of regulating the Internet.

FCC officials have disputed that new net neutrality rules would amount to Internet regulation.

Genachowski has called for the FCC to act on formal rules after an April U.S. appeals court decision striking down the FCC's attempt to enforce informal net neutrality principles in a case involving Comcast's slowing of peer-to-peer traffic.

"The FCC is not a legislating body," Rogers wrote in a Thursday letter to Genachowski. "If this vote is successful, I intend to work with my colleagues to immediately move to enact a disapproval resolution ... as well as subpoena the commission to a hearing examining your reasoning for ignoring the D.C. Circuit Court."