Buckley LLP has gone on the offensive in a battle with its insurer over a $6 million coverage claim, filing a new lawsuit that also delves into alleged actions taken by firm founder Andrew Sandler before and after he left the firm.

The dispute initially became public in a federal lawsuit brought by Oxford Insurance Co. earlier this month, asserting that Sandler was forced out of his leadership role at the firm formerly known as Buckley Sandler because of unspecified misconduct allegations. But in a state court lawsuit filed Tuesday, Buckley called Oxford’s conduct in handling the claim “reprehensible” and claimed that Sandler engaged in hardball tactics after he left the firm.