Jon Kyl Says He's Looking Forward to Returning to the Senate

The speaker accepts a Senate appointment following John McCain's passing, expressing a commitment to represent Arizona and serve through the second session of the 115th Congress. They will not seek re-election or any future office. The decision is driven by duty to the state, the Senate, and the country. The speaker acknowledges unfinished Senate business, including confirming President Trump's nominees, and looks forward to contributing in Washington.

Who did the speaker mention as the previous occupant of the Senate seat?

What unfinished business did the speaker mention in relation to the Senate?