BERLIN (AP) -- While Chancellor Olaf Scholz meets world leaders in Brazil, a discussion is swirling in his party at home about whether he should seek a second term as German leader in an early election expected in February. Unlike their rivals, Scholz's center-left Social Democrats haven't yet formally nominated their candidate for chancellor in the vote expected Feb. 23. And that is generating persistent speculation that the party might instead choose to run with Defense Minister Boris Pistorius, who enjoys higher popularity. Party leaders and Cabinet ministers insist that Scholz will be the candidate, but have struggled to tamp down talk of a switch.