  In this paper, we propose a string theory description of generic 't Hooft
defects in $\mathcal{N}=2$ $SU(N)$ supersymmetric gauge theories. We show that
the space of supersymmetric ground states is given by the moduli space of
singular monopoles and that in this setting, Kronheimer's correspondence is
realized as T-duality. We conjecture that this brane configuration can be used
to study the full dynamics of monopole bubbling.
