Democratic Alliance members will vote for a new interim leader today, who will replace Mmusi Maimane.
Mmusi Maimane resigned from the party and from Parliament in October.
Maimane said he had fought to create a party for all South Africans, but felt that there was a "consistent and coordinated attempt to undermine my leadership and ensure that either this project failed, or I failed".
John Steenhuisen announced he wants to become the party's interim leader and, ultimately, its federal leader in 2020.
“I want to chart a new way forward for the DA. No matter how hard and trying things may seem at the moment because I believe in the end I draw my strength and inspiration from the incredible people of this wonderful organisation,” Steenhuisen said.
Meanwhile his opponent Makashule Gana, said his vision for the DA is a new direction.
Gana said the party needs to move into the political centre if they want to lead South Africa.
And DA deputy federal chair Ivan Meyer is considered a firm favourite to replace Athol Trollip going into today's federal council meeting.
He is running against Khume Ramulifho,MPL in the Gauteng legislature and Nomafrench Mbombo, DA Women's Network leader and Western Cape MEC of Health.