unconstitutionally
adverb /ˌʌnˌkɒnstɪˈtjuːʃənəli/
  /ˌʌnˌkɑːnstɪˈtuːʃənəli/
- in a way that is not allowed by the constitution of a country, a political system or an organization opposite constitutionally (2)Oxford Collocations DictionaryUnconstitutionally is used with these verbs:- act