“continue to defend” against constitutional challenges on various federal regulations concerning firearms.
Not sure what that even means.
Could mean defense against laws which would restrict RKBA. Or it could mean defense against groups which would challenge various restrictions on RKBA as being unconstitutional.
Kagan has made a career out of not taking a controversial position. She has no track record in arguing any issues before the courts. These days that's just precisely what sort of candidate the Executive is looking for.