Question: Who decides when where and how elections for senators and reps will be held?
Disambiguated questions and answers: question: Who decides when elections for US Senators and US Representatives will be held?
Who decides where elections for US Senators and US Representatives will be held?
Who or what decides how elections for US Senators will be held (i.e. by direct election)?
Who decides where, when, and how elections for a state government's senators and representatives will be held?
According to the US Constitution, who can legislate a method by which senators are elected?
answer: Congress
states
Seventeenth Amendment
states
each state (and Congress
Natural Questions answer: States (from the Wikipedia article "Elections in the United States")