If Kelly Loefler does not recognize that Trump lost, then she should be immediately asked why she thinks these Senate races are such a big deal.
The only way the Democrats gain control of the U.S Senate winning these two races is if Kamala Harris is the Vice President and President of the Senate.
Yes, absolutely, that should perhaps be the first question to both candidates: "Will you acknowledge Joe Biden's victory?" If she can't do that, she doesn't believe in American democracy, nor does anyone who votes for her or even just wants her to win.