Leading Birmingham Liberal Democrat city councillor Ayoub Khan is attempting to have four charges of professional misconduct against him struck out by the Bar Standards Board.
Coun Khan, a cabinet member and barrister, faces a disciplinary hearing over claims he smeared a Labour opponent while giving evidence.
The charges arise from an election court hearing in 2008, where Liberal Democrat supporters accused Aston Labour councillor Muhammed Afzal of using underhand methods during that year’s council election campaign.
While in the witness box Coun Khan, who is also an Aston councillor, accused Coun Afzal of being involved in witness intimidation and claimed Afzal’s supporters were behind an arson attack on a Range Rover belonging to a Liberal Demcorat supporter.
But Coun Khan’s evidence was dismissed by the judge, Elections Commissioner Timothy Straker QC, who said the allegations from the witness box amounted to a “sordid story” which was not true.
Mr Straker described Coun Khan as “scurrilous” and said the Range Rover claim was “unpleasant, unsupported and unsubstantiated”.
Following a complaint to the Bar Standards Board by Coun Afzal, Coun Khan was charged with four counts of professional misconduct.
The charges against him include two allegations that he engaged in conduct discreditable to a barrister and two claims that his conduct was likely to diminish public confidence in the legal profession or the administration of justice.
Coun Khan, who denies the charges and claims to be the victim of a political vendetta, will appear before a bar disciplinary tribunal later this month in an attempt to have the case against him struck out.
He is expected to rely on recordings made in a covert surveillance operation against Coun Afzal earlier this year.
Coun Khan arranged for an hour-long conversation involving Coun Afzal to be taped in an effort to produce evidence for the tribunal.
He said he would produce “powerful evidence” to demosntrate that he had been a truthful witness at the election court.
If the tribunal finds against him, Coun Khan could be fined, suspended from practising as a barrister or struck off.
Liberal Democrat party chiefs are sticking by Coun Khan.
Following an internal inquiry the party concluded he had done nothing wrong.
Coun Khan was unavailable for comment.