This is the Cato Dilly Podcast for Tuesday, December 15, 2015.

I'm Caleb Brown.

GOP presidential candidates say they'd use different tactics than President Obama in dealing with ISIS, but getting details

is tough.

Chris Prouble Vice President for Defense and Foreign Policy Studies at the Cato Institute

talks about how reality is and isn't informing the debate over the so-called Islamic

State.

Chuck Todd asked Marco Rubio about problems within the Obama administration strategy with respect to ISIS and his problems

with it and what he would do differently as president.

How do you characterize the Rubio response to that?

Well, I think Senator Rubio and others in the race

who are criticizing President Obama's strategy, which is essentially everyone, everyone in the Republican side,

has a tough time because on the one hand there's a sense that it's not working that ISIS appears to be growing stronger.

That's the sense.

I don't know if that's entirely accurate, but that's what people believe.

And therefore, if ISIS is not getting weaker,

then therefore, by definition, the strategy

must not be working.

Then you jump, well, what would you do differently?

And I think that's where a lot of these candidates

are really struggling struggling because at one level,

doing something differently could include large numbers of U.S. troops.

...