Mealey's (April 10, 2018, 6:03 PM EDT) -- NEW ORLEANS — An insurer recently asked the Fifth Circuit U.S. Court of Appeals to reverse a lower federal court’s finding that it has a duty to defend two underlying malpractice lawsuits filed against its law firm insured, contending that the policy’s prior knowledge clause bars coverage (Allied World Specialty Insurance Co. v. McCathern, PLLC, et al., No. 17-10615, 5th Cir.)....