  3FGL J1544.6-1125 is a candidate transitional millisecond pulsar (tMSP).
Similar to the well-established tMSPs - PSR J1023+0038, IGR J18245-2452, and
XSS J12270-4859 -- 3FGL J1544.6-1125 shows $\gamma$-ray emission and discrete
X-ray "low" and "high" modes during its low-luminosity accretion-disk state.
Coordinated radio/X-ray observations of PSR J1023+0038 in its current
low-luminosity accretion-disk state showed rapidly variable radio continuum
emission-possibly originating from a compact, self-absorbed jet, the
"propellering" of accretion material, and/or pulsar moding. 3FGL J1544.6-1125
is currently the only other (candidate) tMSP system in this state, and can be
studied to see whether tMSPs are typically radio-loud compared to other neutron
star binaries. In this work, we present a quasi-simultaneous Very Large Array
and Swift radio/X-ray campaign on 3FGL J1544.6-1125. We detect 10 GHz radio
emission varying in flux density from $47.7 \pm 6.0$ $\mu$Jy down to $\sim$15
$\mu$Jy (3$\sigma$ upper limit) at four epochs spanning three weeks. At the
brightest epoch, the radio luminosity is $L_{5 GHz}$ $= (2.17 \pm 0.17) \times
10^{27}$ erg s$^{-1}$ for a quasi-simultaneous X-ray luminosity $L_{2-10 keV}$
$= (4.32 \pm 0.23) \times 10^{33}$ erg s$^{-1}$ (for an assumed distance of 3.8
kpc). These luminosities are close to those of PSR J1023+0038, and the results
strengthen the case that 3FGL J1544.6-1125 is a tMSP showing similar
phenomenology to PSR J1023+0038.
