When trying to impeach the president, the House of Representatives votes for whether or not a president will have a formal trial. From there, the arguments for and against impeachment will be heard by the US Senate. In this case, the US Senate acts as judge and jury. Ultimately, they must decide whether the president will be officially removed from office.
Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine.