The poll is scheduled for November 13, but the opposition has voiced concern that the government is dragging its feet over preparations.
The government's decision to register new political parties ahead of the election also angered Waddani and the opposition Justice and Welfare party (UCID) over fears it will dilute support for them.
Several people have been killed and dozens wounded after police opened fire on anti-government demonstrators in several towns in the breakaway Somali region of Somaliland, opposition party members and witnesses said.
Hundreds of people took to the streets in the capital Hargeisa and the cities of Burao and Erigavo on Thursday after negotiations between the government and opposition parties broke down, with the latter accusing the authorities of seeking to delay a presidential election due in November.
