If it were me, I would tell Karzai that unfortunately we don’t have any laws against burning trash.
Much more mild than my response. I'd summon him before me, burn a Koran on live Afghanistan television and then announce that for every death a mosque will be leveled. The first three have been picked and will be demolished in 15 minutes with high explosive munitions. Those in and around mosques might want to move away now, just in case their mosque was one that was randomly selected.
There's a reason why I'm usually the last one picked to play 'global leader.'