We The People of the United States in order to form a more perfect union, establish justice, insure domestic tranquility, provide for the common defense, promote the general welfare, and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this Constitution for the United States of America.
Article 1 Section 3
The Senate shall have the sole power to try all impeachments. When sitting for that purpose, they shall be on oath of affirmation. When the President of The United States is tried, the Chief Justice shall preside: And no person shall be convicted without the concurrence of two thirds of the members present. Judgment in cases of impeachment shall not extend further than to removal from office, and disqualification to hold and enjoy any office of honor, trust or profit under the United States: but be liable and subject to indictment, trial, judgment and punishment, according to law.