We discuss the measurement of the charged-current elastic scattering process $e^{-}p\to {\nu }_{e}n$ at the Electron-Ion Collider (EIC). This process provides sensitivity to the poorly constrained axial radius of the nucleon. Collisions of electrons with polarized protons enable measuring the $e^{-}\overrightarrow{p}\to {\nu }_{e}n$ target-spin asymmetry for the first time. We conclude that a measurement of charged-current elastic scattering at the EIC will, perhaps unsurprisingly, prove very challenging. However, with dedicated instrumentation at a second EIC detector, the measurement may be possible.

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• Electroweak interactions in nuclear physics
• Lepton-hadron interactions
• Neutrino interactions
• Polarization in interactions & scattering
• Electrons
• Neutrinos
• Protons
• Form factors