Dentons, the rapidly expanding international law firm with roots in Chicago, has made a “serious overture” to D.C. law and lobbying firm Patton Boggs about combining, as Patton Boggs continues merger talks with Cleveland-based law firm Squire Sanders.

“We hold Patton Boggs and its lawyers and professionals in high regard, and our interest in conversations between our firms and partners remains high,” a Denton spokeswoman said in a statement Thursday.

The Dentons spokeswoman declined to elaborate on what the response, if any, from Patton Boggs has been, or whether the firms were engaged in talks.

Representatives from Patton Boggs did not immediately return requests seeking comment. The Washington lobbying powerhouse has been in merger talks with the much-larger global law firm Squire Sanders since late February. The firm has been reorganizing since early 2013, letting go a combined 110 lawyers and staff, deciding to close its once-profitable Newark office and engaging in merger talks with at least three other law firms. Revenue at the firm has fallen 18 percent since 2011, from $340 million to $279 million, and the firm’s partners last year approved a restructuring plan. The firm recently hired financial advisers.