Reporter's Explanation of Changes
1. Add reference to "law and fact"
This change makes explicit the requirement that a claim must have a nonfrivolous basis in both law and fact. See also Comment . No change in substance is intended.
 A new sentence has been added to remind lawyers that they must act reasonably to inform themselves about the facts and law pertinent to a claim they will make on behalf of a client. The reference to a client's purpose to harass has been dropped because the client's purpose is not relevant to the objective merits of the client's claim.
 This new Comment acknowledges the primacy of constitutional law that might require a lawyer to take action on behalf of a criminal defendant that otherwise would violate this Rule.