Waterboarding, an international crime?

After WW2, an international tribunal was set up to prosecute the various Japanese commanders who had tortured Allied prisoners. One particular charge was the enhanced interogation technique called waterboarding. In fact some POW commandants were found guilty of using this technique and imprisoned, and in some cases, hung. So will an international tribunal seek out Pres. Bush and others who authorize /utilize waterboarding and prosecute them?