David Rivkin Jr. and Lee Casey argued for months that the health care overhaul under consideration in Congress was unconstitutional. Now, the two Baker Hostetler partners will have a chance to make the case in court.

Rivkin and Casey, who work in the firm’s Washington office, have signed on as outside counsel to several state attorneys general who want the legislation overturned in court. The litigation is the initial wave of what is expected to be a long series of lawsuits challenging various pieces of the overhaul, which won final congressional approval Sunday.