The Disclosure Tribunal, chaired by Supreme Court Judge Peter Charleton, is set up to examine allegations that senior gardaí were involved in a smear campaign against Sgt Maurice McCabe, among other issues.

The first interim report of the tribunal is laid before the Houses of the Oireachtas.

The second interim report of the tribunal, dealing with matters relating to Garda Keith Harrison, is delivered to the Dáil and published. It finds that all allegations of Garda Keith Harrison and Marisa Simms (pictured) examined by the tribunal are "entirely without any validity".

Former Garda Commissioner Nóirín O'Sullivan tells the Disclosures Tribunal that she faced an almost impossible dilemma when dealing with whistleblower Sergeant Maurice McCabe at the O'Higgins Commission.

She said she had to test the evidence, while also continuing to support him, but she said she never considered him to be malicious and had no reason to challenge his integrity.

Former Minister for Justice Frances Fitzgerald tells the Disclosures Tribunal that she made a conscious decision not to interfere with the O'Higgins Commission as it would have been inappropriate.

Garda whistleblower Sergeant Maurice McCabe says he was told that former garda commissioner Martin Callinan told Fianna Fáil TD John McGuinness that Sgt McCabe had abused his own children and his nieces, and was not to be trusted. He becomes emotional while giving his evidence.

Former garda press officer Supt David Taylor alleges that he was directed by former garda commissioner Martin Callinan to brief journalists negatively about whistleblower Sergeant Maurice McCabe, and that this was done with the knowledge of former commissioner Nóirín O'Sullivan.

Supt Taylor told the Disclosures Tribunal that negative briefing of the media against Sgt McCabe happened in an opportunist and random way.

Former garda commissioner Martin Callinan denies that he was trying to blacken the character of whistleblower Sergeant Maurice McCabe.

He denies telling several individuals that Sgt McCabe could not be trusted and was a child abuser.

He also says he did not put into the public domain a story that Sgt Maurice McCabe had not co-operated with the internal garda inquiry into the quashing of penalty points.

RTÉ Crime Correspondent Paul Reynolds tells the Disclosures Tribunal that he was not negatively briefed by the former head of the Garda Press Office, Superintendent David Taylor, about Sgt Maurice McCabe.

TD Mick Wallace says that former Garda Press Officer Supt Dave Taylor misrepresented and exaggerated his situation to him and his colleague, Clare Daly TD.

Mr Wallace says Supt Taylor embellished his own problems in terms of the garda investigation into his disclosing of information and he claims that what had emerged at the tribunal showed there was good cause to investigate him.

The Disclosures Tribunal concludes its final hearings on whistleblower Sgt Maurice McCabe after around 80 days of sittings at Dublin Castle.

The third interim report of the tribunal, dealing with the HSE, TUSLA, RTÉ, garda headquarters and garda officers concerning Sgt Maurice McCabe, is delivered to the Dáil and published.

It praises Sgt McCabe and is critical of former Commissioner Martin Callinan and former garda press officer David Taylor, but says Nóirín O'Sullivan did not challenge the integrity of Sgt McCabe.