Attorney General Eric Holder is telling Congress that marijuana’s impact on children is a factor as the Justice Department decides how to respond to two states that have legalized the drug.

Holder made the comment Thursday at a House hearing when he was asked about initiatives passed last year by Washington state and Colorado.

Holder says that his department is continuing to review the initiatives, and has not made a decision yet on how to respond. It could sue to block legal pot sales from ever happening, on the grounds that they conflict with federal law.

President Barack Obama has said that going after marijuana users in states where it’s legal is not a priority. Holder says that Obama hasn’t said he’s for legalization, adding that he isn’t either.