  The recent experimental study of the far-infrared transmission spectroscopy
of monolayer graphene has shown that the Drude peak width increases by more
than $10\%$ per $1\%$ of applied mechanical strain, while the Drude weight
remains unchanged. We study the influence of the strain on the resonant
impurity scattering. We propose a mechanism of augmentation of the scattering
rate due to the shift in the position of resonance. Using the Lifshitz model of
substitutional impurities, we investigate changes in the Drude peak weight and
width as functions of the Fermi energy, impurity concentration and magnitude of
the impurity potential.
