Sam/Galen
Except he likely knows it’d be a false accusation and making knowingly false claims to lower America’s score out of pettiness would bring him under scrutiny. If he knew you were the type to work for the other side in intention of taking it down from the inside, then by outing you may seem like in favor of America by gaining a few points, but ultimately only helps the Russians from blocking off your access.
It only makes sense if he was trying to take suspicion off himself.