The head of the Federal Trade Commission said Dec. 14 she won’t remove herself from an antitrust review of Google Inc.’s purchase of online advertising company DoubleClick, rebuffing requests from privacy groups opposed to the transaction.

Deborah Platt Majoras, chairwoman of the FTC, said she has reviewed a petition from the groups with the agency’s ethics official and determined that “the relevant laws and rules … neither require nor support recusal.”