The best-known figure in the nationalist Alternative for Germany says that she won't be its top candidate in September's German election — a decision that appears to reflect growing opposition among other leading members of the party.

Frauke Petry ousted co-founder Bernd Lucke, an economics professor, to become the party's chairwoman in 2015. Opposition to immigration and Islam have taken center stage in the party's platform since then.

But the party also has become increasingly mired in infighting between Petry, her husband Marcus Pretzell and other senior figures.

Petry said in a video message posted Wednesday on Facebook that she won't lead the party's election campaign, either alone or as part of a team.