The Ninth Circuit reversed the District of Montana’s denial of a motion to compel arbitration on the grounds that “the insurer was estopped from asserting contract defenses as a result of its breach of its duty to defend.” The Ninth Circuit held that neither the 2014 Montana Supreme Court decision Tidyman’s Management Services, Inc. v. Davis, 330 P.3d 1139, nor any other Montana case, treats an agreement to arbitrate as a contract defense that an insurer is estopped from asserting as a result of its breach of its duty to defend. Rather, such agreement “establishes how the parties choose to resolve disputes arising out of the contract.” A party successfully compelling arbitration “may nevertheless have any insurance contract defenses arising out of its policy resolved against it by the arbitrator.”

Am. Trucking & Transp. Ins. Co., v. Nelson, No. 18-35414 (9th Cir. June 4, 2019)