Learn Spanish (Latin America): Es este reportero quien debe aclarar la información. - It is this reporter who must clarify the information.

This is a cleft sentence, which is a structure used to emphasize a specific piece of information. Just like in English ('It is this reporter who...'), Spanish uses the verb ser (here, es) at the beginning to put the spotlight on the focused element, which is este reportero.

Could I use que instead of quien here?

Yes, you could use a variation with que, such as Es este reportero el que debe... or simply Es este reportero que debe.... However, when emphasizing a person in this type of structure, using quien (who) is extremely common and considered the most precise choice.

What would happen to the sentence if we were talking about multiple reporters?

The verb ser, the demonstrative adjective, the noun, the relative pronoun, and the main verb would all change to plural! You would say: Son estos reporteros quienes deben aclarar la información. Notice how es becomes son and quien becomes quienes to match the plural subject.

Why does the sentence use debe for 'must' instead of tiene que?