Who served as a Republican Senate Minority Whip?

The correct answer is Jon Kyl. He served as the Republican Senate Minority Whip from 2007 until 2013. The role of the Minority Whip is to assist the Minority Leader in coordinating and mobilizing party members to ensure party discipline and to effectively manage the legislative agenda within the minority party. Kyl held a significant leadership role during a time when the Republicans were in the minority in the Senate, working to support his party's objectives and strategy.

Mitch McConnell, while a prominent Republican figure and currently a long-serving Minority Leader, is not known as Minority Whip in the context provided. Daniel Inouye was a Democratic senator known for his leadership roles and contributions, and Harry Reid was a Democratic Senate Majority Leader; neither served as a Republican Minority Whip. Therefore, Jon Kyl is the individual who accurately fits the role described in the question.