Sorry, but IMO that's a very bad idea. You won't defeat ISIS with nukes, but you will have unbelievable collateral damage.
I know, but it was a fun idea while it lasted. Anyone anywhere with suspected ISIS ties is to be taken into immediate custody and fairly interrogated. If the ties are found to be accurate, a military tribunal will be convened immediately in a neutral non-US location (Guantanamo?) Punishment if found guilty will be swift and sure.
AANY retaliation will be dealt with quickly and with finality.
ISIS members will be given ONE chance to surrender. They will be taken into custody and will be placed in internment camps. A steady diet of good food, fun music, education and some good old fashioned American values will be given them for at least a solid year. They will then be re-evaluated and at that point, their internment will continue or if they have become non-radicalized, they will be released.
ISIS members known to have engaged in terrorist activity will be executed.
Those who are hiding or aiding ISIS members will be shown no quarter.
Governments who are known to assist ISIS will live under constant threat of attack.
Our intelligence networks will be rebuilt quickly using all possible means, human, satellite, cyber, etc.
Soldiers will be given wide latitude rules of engagement. See a man with a gun. Kill him, don’t wait to be fired on.
See an arab man abusing a child, kill him.
Put out a worldwide bounty on ISIS members.