The second day of a defamation case against former Conservative Party leader Colin Craig is to begin at the High Court at Auckland this morning.

Taxpayers' Union executive director Jordan Williams launched civil proceedings after Craig allegedly defamed him last year at a press conference, and again in a leaflet sent to more than 1.6 million households.

Williams claims Craig was behind a "campaign of defamatory lies" against him and he is seeking general and punitive damages totalling more than $300,000 in relation to the comments at the press conference and a further $600,000 in relation to the pamphlet.

The trial, scheduled for five weeks, started yesterday with Justice Sarah Katz presiding.

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The jury is expected to hear evidence from Williams and Craig during the trial.