On May 16, 1868, the U.S. Senate narrowly failed to convict President Andrew Johnson during his impeachment trial. The vote on Article 11 resulted in 35 senators voting “guilty” and 19 voting “not guilty,” falling just one vote short of the two-thirds majority (36 votes) required for conviction under the Constitution .?U.S. Senate

The impeachment stemmed primarily from Johnson’s violation of the Tenure of Office Act, which restricted the president’s power to remove certain officeholders without the Senate’s approval. Johnson had attempted to dismiss Secretary of War Edwin Stanton and replace him with Lorenzo Thomas, actions that led to the House of Representatives adopting 11 articles of impeachment against him .?Wikipedia

After the initial vote on Article 11, the Senate adjourned for 10 days. Upon reconvening on May 26, 1868, the Senate voted on Articles 2 and 3, both of which also resulted in 35 “guilty” and 19 “not guilty” votes—again, one vote short of conviction. Following these votes, the Senate adjourned the impeachment trial without voting on the remaining eight articles .?Wikipedia

The decisive vote against conviction on Article 11 was cast by Senator Edmund G. Ross of Kansas. His vote was pivotal in Johnson’s acquittal and has been the subject of historical debate and analysis .?