Lawyers for six lobbyists fighting what they call a “constitutionally problematic” Obama administration policy want a federal appeals court in Washington to revive their lawsuit. The challengers, represented by a team from Mayer Brown, argue in the U.S. Court of Appeals for the D.C. Circuit that a judge got it wrong when she upheld the administration’s ban on lobbyists serving on agency boards and committees.

“It would seem self-evident that the ability to serve on a government advisory committee is a desirable and beneficial opportunity that many would regard as valuable,” Mayer Brown special counsel Charles Rothfeld and associate Joseph Minta, representing the lobbyists, wrote in a brief filed on May 6. “And that opportunity is withheld from plaintiffs here solely because they engage in the constitutionally protected activity of petitioning the government, thus both punishing and ­discouraging that constitutionally protected activity.”