Colin Craig's legal team plan to show a jury at his defamation trial "correspondence" and text messages he received from his former press secretary Rachel MacGregor.
The former leader of the Conservative Party, Craig is on trial for allegedly defaming Taxpayers' Union director Jordan Williams, a friend of MacGregor's to whom she turned after her high-profile shock resignation shortly before the 2014 general election.
Williams said he was "horrified" at MacGregor's claims Craig had sexually harassed her, and after seeing letters and poems the politician sent her, revealed all to other Conservative Party members.
In response Craig claimed Williams was part of a group of "culprits" determined to have him removed as party leader through a "campaign" of "false accusations".