Tsvangirai, the leader of the Movement for Democratic Change (MDC) and two senior MDC colleagues are accused of plotting to kill President Robert Mugabe last year.
All three could face death sentences if convicted of the charges, which they have denied.
Judge Paddington Garwe said Canadian political consultant Ari Ben-Menashe -- the state's star witness in the case -- must supply defense lawyers with a collection of documents detailing his business dealings with the Zimbabwean government.
Among the items Ben-Menashe was ordered to produce were a list of his employees and contractors, what work they did for the Zimbabwe government, a certified account of nearly $100,000 his company received from Tsvangirai's MDC party, his company registration papers and financial accounts for 2001 and 2002.
But Garwe turned down a request for information such as contracts that Ben-Menashe's firm might have registered in the United States, which the defense believes may lay out a clearer paper trail on his activities.
"I find no basis for ordering (the witness to produce) such information...and I am not persuaded to its relevance," he said.
Garwe made the order in the absence of Ben-Menashe, who was given a week off last Friday to attend to private matters in Canada. The trial is officially due to resume on March 3.
The state's case against the MDC leaders rests mainly on a video tape of a meeting in Canada between Ben-Menashe and Tsvangirai, who allegedly discussed Mugabe's "elimination."
The tape was recorded just before Ben-Menashe's firm, Montreal-based Dickens and Madson, signed a contract with the Zimbabwe government.
Last Thursday, Ben-Menashe admitted he taped the meeting solely to get incriminating evidence for Mugabe's government but denied entrapping Tsvangirai, who he described as intent on the idea of killing Mugabe.
Tsvangirai's defense lawyers have repeatedly criticized Ben-Menashe as an unreliable witness.
Morgan Tsvangirai, President of the Zimbabwe opposition Movement for Democratic Change (MDC), and his wife Susan arrive at the High Court in Harare February 3, 2003. Tsvangirai is facing charges of plotting to assassinate President Robert Mugabe and seize power in the troubled African country. The trial was delayed after baton-wielding police tried to bar reporters, diplomats, and Tsvangirai's supporters from the High Court, sparking scuffles with the crowd gathered outside. (Howard Burditt/Reuters)
The defense says the video tape was doctored to discredit the opposition as Mugabe faces a deepening economic and political crisis which critics say is due in large part to the veteran leader's mismanagement.
State prosecutors have argued that Tsvangirai plotted to kill Mugabe as part of a larger plan to stage a coup d'etat in the southern African country, which Mugabe's ZANU-PF party has ruled since independence from Britain in 1980. [End]
