TAIPEI, Oct 13 (AP) -- Taiwanese lawmakers were set Friday for a key vote on whether to put the issue of ousting embattled President Chen Shui-bian to the island's voters, following weeks of street protests calling for his ouster over corruption allegations.

The opposition-led recall measure is given little chance of success because it needs to muster a two-thirds majority in the 221-seat Legislature -- which the opposition does not have. A previous recall attempt failed in June.

But the drive keeps up pressure on Chen over scandals involving members of his inner circle that have been simmering for more than six months. Chen denies any wrongdoing, and insists he will not leave office until his second and final term ends in May 2008.

His son-in-law was arrested in May and later indicted on charges of insider trading involving a development company. He has denied the charges against him.

Last week, prosecutors cleared Chen's wife of accepting bribes to help clear the way for transferring the ownership of an upscale Taipei department store.

A separate investigation into the alleged misuse of secret diplomatic funds under presidential control is continuing, but Chen has said he is innocent of any wrongdoing.

The recall proposal needs the support of at least two dozen lawmakers affiliated with Chen's Democratic Progressive Party to have any chance of passing.

The DPP, which has a total of 85 seats, has said its members will stay away from the vote. The DPP supports the president's claims of innocence and says the Legislature should focus on debating public policies.

Chen has faced a high-profile campaign of street protests since early last month, when former Chen ally Shih Ming-teh started leading sit-in protests in downtown Taipei calling for the president's ouster.

During Tuesday's National Day celebrations, opposition lawmakers tried to disrupt Chen's speech while protesters marched through downtown Taipei.