Constitution of the State of Illinois Art. IV, § 14. Impeachment

The House of Representatives has the sole power to conduct legislative investigations to determine the existence of cause for impeachment and, by the vote of a majority of the members elected, to impeach Executive and Judicial officers. Impeachments shall be tried by the Senate. When sitting for that purpose, Senators shall be upon oath, or affirmation, to do justice according to law. If the Governor is tried, the Chief Justice of the Supreme Court shall preside. No person shall be convicted without the concurrence of two-thirds of the Senators elected. Judgment shall not extend beyond removal from office and disqualification to hold any public office of this State. An impeached officer, whether convicted or acquitted, shall be liable to prosecution, trial, judgment and punishment according to law.