Full Idea
Semantic theories give a class of models with a truth predicate, ...but Tarski taught us that this needs a more encompassing framework than its language...so how is the semantics of the framework expressed? The model route has a regress.
Gist of Idea
Semantic theories have a regress problem in describing truth in the languages for the models
Source
Leon Horsten (The Tarskian Turn [2011], 02.3)
Book Reference
Horsten,Leon: 'The Tarskian Turn' [MIT 2011], p.21
A Reaction
[compressed] So this regress problem, of endless theories of truth going up the hierarchy, is Horsten's main reason for opting for axiomatic theories, which he then tries to strengthen, so that they are not quite so deflated.