  We investigate the Meissner effect in a parametrically driven superconductor
using a semiclassical $U(1)$ lattice gauge theory. Specifically, we
periodically drive the $z$-axis tunneling, which leads to an enhancement of the
imaginary part of the $z$-axis conductivity at low frequencies if the driving
frequency is blue-detuned from the plasma frequency. This has been proposed as
a possible mechanism for light-enhanced interlayer transport in
YBa$_2$C$_3$O$_{7-\delta}$ (YBCO). In contrast to this enhancement of the
conductivity, we find that the screening of magnetic fields is less effective
than in equilibrium for blue-detuned driving, while it displays a tendency to
be enhanced for red-detuned driving.
