N.Y. R. Prof'l Conduct 1.16

(a) A lawyer shall not accept employment on behalf of a person if the lawyer knows or reasonably should know that such person wishes to:

(1) bring a legal action, conduct a defense, or assert a position in a matter, or otherwise have steps taken for such person, merely for the purpose of harassing or maliciously injuring any person; or

(2) present a claim or defense in a matter that is not warranted under existing law, unless it can be supported by a good faith argument for an extension, modification, or reversal of existing law.

(b) Except as stated in paragraph (d), a lawyer shall withdraw from the representation of a client when:

(1) the lawyer knows or reasonably should know that the representation will result in a violation of these Rules or of law;

(2) the lawyer's physical or mental condition materially impairs the lawyer's ability to represent the client;

(3) the lawyer is discharged; or

(4) the lawyer knows or reasonably should know that the client is bringing the legal action, conducting the defense, or asserting a position in the matter, or is otherwise having steps taken, merely for the purpose of harassing or maliciously injuring any person.

(c) Except as stated in paragraph (d), a lawyer may withdraw from representing a client when:

(1) withdrawal can be accomplished without material adverse effect on the interests of the client;

(2) the client persists in a course of action involving the lawyer's services that the lawyer reasonably believes is criminal or fraudulent;

(3) the client has used the lawyer's services to perpetrate a crime or fraud;

(4) the client insists upon taking action with which the lawyer has a fundamental disagreement;

(5) the client deliberately disregards an agreement or obligation to the lawyer as to expenses or fees;

(6) the client insists upon presenting a claim or defense that is not warranted under existing law and cannot be supported by good faith argument for an extension, modification, or reversal of existing law;

(7) the client fails to cooperate in the representation or otherwise renders the representation unreasonably difficult for the lawyer to carry out employment effectively;

(8) the lawyer's inability to work with co-counsel indicates that the best interest of the client likely will be served by withdrawal;

(9) the lawyer's mental or physical condition renders it difficult for the lawyer to carry out the representation effectively;

(10) the client knowingly and freely assents to termination of the employment;

(11) withdrawal is permitted under Rule 1.13(c) or other law;

(12) the lawyer believes in good faith, in a matter pending before a tribunal, that the tribunal will find the existence of other good cause for withdrawal; or

(13) the client insists that the lawyer pursue a course of conduct which is illegal or prohibited under these Rules.

(d) If permission for withdrawal from employment is required by the rules of a tribunal, a lawyer shall not withdraw from employment in a matter before that tribunal without its permission. When ordered to do so by a tribunal, a lawyer shall continue representation notwithstanding good cause for terminating the representation.

(e) Even when withdrawal is otherwise permitted or required, upon termination of representation, a lawyer shall take steps, to the extent reasonably practicable, to avoid foreseeable prejudice to the rights of the client, including giving reasonable notice to the client, allowing time for employment of other counsel, delivering to the client all papers and property to which the client is entitled, promptly refunding any part of a fee paid in advance that has not been earned and complying with applicable laws and rules.