Who does a U.S. senator represent?

What does this answer mean?

A U.S. senator represents all the people of their state. USCIS accepts "citizens of their state" or "people of their state."

That's different from a member of the House, who represents one congressional district within a state. A senator's voters are everyone in the state, so each of a state's two senators represents the whole state.

Senators serve six-year terms. Since the 17th Amendment was ratified in 1913, the voters of each state elect their senators directly. Before that, state legislatures chose them.

Because a senator represents the whole state, the answer to "Who is one of your state's U.S. senators now?" depends only on your state, not on your address. Every state has two senators, and you can name either one for that question.

Washington, D.C., and the U.S. territories don't have senators, so people who live there aren't represented in the Senate.

At the interview, say "the people of their state."