South Africa’s fragile unity government has been shaken again. The country’s second-largest political party broke with partners Wednesday and voted against a national budget.

South Africa's two biggest political parties, the African National Congress and the pro-business Democratic Alliance were yet to reach agreement to pass the budget on Tuesday, hours before a key parliamentary committee was set to debate it.

South African opposition party the Economic Freedom Fighters has written to the speaker of parliament seeking to block lawmakers from meeting on Wednesday to vote on the next stage of the budget process.