"I am urging Ukrainian citizens to join our signature collection campaign for a vote of no-confidence in the president, and demand that an early presidential election be held," Petro Symonenko said.
He said Yushchenko is a threat to the country's integrity and unity, and that the signing of an agreement between the president, prime minister and parliamentary speaker was a mistake, as the head of state does not honor the accords he signs.
President Yushchenko announced on Sunday that early parliamentary elections in the country would be held on September 30. The announcement came after hours of tense negotiations between Yushchenko and his rival, Prime Minister Viktor Yanukovych, aimed at ending a long-running political crisis in the country.
The prime minister's Party of Regions said Tuesday it would ask its leader to withdraw his signature if members of Yushchenko's inner circle continue their attempts to review the document.
Yushchenko on Tuesday suspended for two days his decree on parliament's dissolution, to give parliament, the Supreme Rada, time to adopt laws needed to hold snap elections.
Pro-Western leader Yushchenko issued the April 26 decree shortly before the Constitutional Court was to rule on his previous order of April 2 that set early polls for May 27. The move outraged the pro-Russian Yanukovych and his allies in the 450-seat unicameral parliament, who opposed snap elections, prolonging the crisis in the ex-Soviet state.
Yushchenko has been pressing for parliament's dissolution and early elections following the defection of 11 opposition members to the premier-led ruling coalition in parliament, which the president said breached the Constitution.
