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This contribution is concerned with deriving the scattering of a time harmonic Gaussian beam from a moving PEC wedge. The incident wave object serve as the basis wave propagators of the phase-space beam summation method which is a general framework for analyzing propagation of scalar and electromagnetic fields from extended sources. By utilizing the Lorentz Transformation and applying Maxwell's boundary conditions in the (scatterer) co-moving frame, an exact solution for the total fields is obtained in both the laboratory and the co-moving frames in the form of spectral integrals. Finally, by using high frequency asymptotic, spectral representation of the total electromagnetic fields is obtained.