He should hire Flynn’s lawyer. She’s done a great job!/snicker
The major Washington firms do pro bono work all the time for highly politicized causes. It's just another form of political warfare. One firm that can remain nameless represented Greenpeace in a suit against the Navy for colliding with one of their protest vessels. That firm, almost entirely allied with the Democratic party, had lobbying arms and law partners raking in tens of millions of dollars representing the defense industry (and thereby, arguably raising the cost of acquisition of weapons systems and technology for the nation's defense) but managed to find the time to represent, gratis, a protest organization that was suing the Navy (thereby driving up the cost to the taxpayers of defending the suit.) A nice snarky move, that allows them to attribute the hours donated as pro bono representation, while getting in some kicks and generating some bad press for the Republicans in the White House at the time.
The role of law firms acting as cut outs - a law Perkins Coie in the Russiagate Scam - is something as big as the proverbial 900 lb. gorilla in the living room, that the press in DC cannot manage to find with both hands. So, expecting them to notice this pro bono practice is maybe a bit much...