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Recently, CHIME detected periodicity in the bursting rate of the repeatingFRB 180916.J0158+65. In a popular class of models, the fast radio bursts (FRBs)are created by giant magnetic flares of a hyper-active magnetar driven by fastambipolar diffusion in the core. We point out that in this scenario themagnetar is expected to precess freely with a period of hours to weeks. Theinternal magnetic field $B\sim 10^{16}$G deforms the star, and magnetic flaresinduce sudden changes in magnetic stresses. The resulting torques anddisplacements of the principal axes of inertia are capable of pumping asignificant amplitude of precession. The anisotropy of the flaring FRBactivity, combined with precession, implies a strong periodic modulation of thevisible bursting rate. The ultra-strong field invoked in the magnetar modelprovides: (1) energy for the frequent giant flares, (2) the high rate ofambipolar diffusion, releasing the magnetic energy on the timescale $\sim10^9$s, (3) the core temperature $T\approx 10^9$K, likely above the criticaltemperature for neutron superfluidity, (4) strong magnetospheric torques, whichefficiently spin down the star, and (5) deformation with ellipticity $\epsilon>10^{-6}$, much greater than the rotational deformation. These conditions resultin a precession with negligible viscous damping, and can explain the observed16 day period in FRB 180916.J0158+65.

Precessing flaring magnetar as a source of repeating FRB 180916.J0158+65