Cape Town - All 25 EFF MPs on Thursday received formal letters from Speaker Baleka Mbete asking them to motivate why the party should not be suspended from Parliament for disrupting a sitting.
"We received the letters today and we have to respond by tomorrow," said Economic Freedom Fighters MP Mbuyiseni Ndlozi.
EFF leader Julius Malema was expected to brief media at the party's offices at Parliament at 13:00 to announce how it planned to respond.
Last Thursday, the EFF defied orders from Mbete to leave the National Assembly after they disrupted presidential question time.
They chanted that President Jacob Zuma should repay public funds spent on his home in Nkandla.