De Lille's party, the Democratic Alliance, has since said it would be asking her for reasons why she attended, saying she had not informed the party beforehand, as was protocol.
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Nt'sekhe says the DA did seek an explanation as to why De Lille did not inform the party prior to the EFF memorial.
During the memorial service in Brandfort in the Free State province on Wednesday, De Lille recalled the last time Madikizela-Mandela called her in December previous year.
Shivambu on Thursday claimed the DA's request was "evidently [a] witch hunt by the lily white liberals".
The party responded to the EFF's invitation by sending its Free State provincial leader Patricia Kopane to represent the DA.
Political parties regularly send invitations to the DA to attend events or rallies.
City of Cape Town mayor Patricia de Lille gestures during a service to pray for her at World Harvest Ministries on January 14, 2018 in Langa, South Africa. I mean [DA leader Mmusi Maimane] has done so.
Everyone can understand that she would wish to be part of a memorial service for Mam'Winnie, because this is a huge icon that has passed on.
"Nobody says there is a problem with the mayor speaking at the event".
De Lille meanwhile was unavailable to comment on the issue at the time of publication, telling News24 she was in a meeting.
He would pay his respects at the official funeral on Saturday.
Addressing the crowd at the memorial‚ De Lille spoke fondly about Madikizela-Mandela and their relationship.