impeachment
100

step one to impeachment 

congress investigates

200

second step of impeachment

 the House of Representatives must pass, by a simple majority of those present and voting, articles of impeachment, which constitute the formal allegation or allegations

300

third step to impeachment

senate tries the accused

400

who takes office after impeachment

vice president

500

what amendment allows the vice president to take office after impeachment 

25th