Subject to further amendments.
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The president is under pressure to quit over a string of corruption scandals surrounding his family and aides.
But organisers of Saturday's march did not defend the president directly, saying only that the opposition campaign was endangering Taiwan's democracy.
Emergency order
The rally in support of Mr Chen is expected to begin at 1500 local time (0700 GMT).
It is being organised by the pro-government Taiwan Group, but reports say Mr Chen's Democratic Progressive Party (DPP) has issued an emergency order to mobilise party members nationwide.
The party is laying on buses to bring supporters to the capital, a measure which it is thought could boost turnout to as many as 100,000.
While police said 320,000 red-clad demonstrators marched on Friday, organisers put the figure at three quarters of a million.
"The political gesture, colour, symbols, after being exaggerated by the media, has caused massive fears among the people," the DPP was quoted as saying by AFP news agency.
"This has hurt Taiwan's democracy."
Saturday's demonstrators will gather outside the presidential office - a space vacated by opponents of the president, who have been holding a round-the-clock vigil there.
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