Determined to impeach Johnston for neglect of his duties by the end of 1927, the legislative leaders met in special session under a newly adopted initiative proposition. This measure was introduced to deal with Governor Jack C. Walton's impeachment four years earlier. In this special session, the state legislature announced its plans to investigate the governor. Before the Oklahoma Legislature could act, the Oklahoma Supreme Court intervened to the benefit of Johnston. The court ruled in the case "Simpson v. Hill" that the Legislature's actions were unconstitutional and that they could only meet during regular sessions or at the call of the governor in special session. Following the Supreme Court's example, Oklahoma City's district court issued an injunction against the Oklahoma Legislature, preventing state lawmakers from convening.