Authorization for such a promotion "with the advice and consent of the Senate" was provided by a new bill which Lincoln signed the same day he submitted Grant's name to the Senate.
ˌɔːθɚɹᵻzˈeɪʃən fɔːɹ sˈʌtʃ ɐ pɹəmˈoʊʃən "wɪððɪ ɐdvˈaɪs ænd kənsˈɛnt ʌvðə sˈɛnət" wʌz pɹəvˈaɪdᵻd baɪ ɐ nˈuː bˈɪl wˌɪtʃ lˈɪŋkən sˈaɪnd ðə sˈeɪm dˈeɪ hiː səbmˈɪɾᵻd ɡɹˈænts nˈeɪm tə ðə sˈɛnət.