In an explosive personal statement, Cllr Rob Stewart said the “last shreds of trust” in the Welsh Rugby Union have been “completely destroyed.”
It comes after the council published bombshell minutes from a secret January meeting, which revealed the WRU’s plan to axe the Ospreys by 2027.
In a bizarre twist, it has emerged that the WRU itself may have inadvertently caused the secret notes to be made public by submitting a Freedom of Information (FOI) request to the council.
Cllr Stewart branded the move “really you could not make this up,” suggesting the WRU accidentally forced the release of information they were trying to keep private.
He said: “It’s now really clear the actions were duplicitous, the statements misleading, the processes predetermined.”
“Ms Tierney must now resign immediately to restore trust in Welsh rugby.”
The Council Leader also turned his fire on the wider WRU board, questioning whether the chairman and other directors were aware of the “misleading” statements.
He raised “serious concerns” about whether the WRU leadership had misled a Senedd committee during recent evidence sessions.
The Senedd has already accused the WRU of a “dereliction of duty” over its plans to cut a Welsh region.
Cllr Stewart added: “WRU leaders cannot mislead fans, Government and the public and remain in post — it’s time to go!”
The fallout follows the council’s decision to launch high-stakes legal action to block the sale of Cardiff Rugby to Ospreys owners Y11.
The council claims the deal is a “predetermined” move to wipe out the Ospreys as a regional force in West Wales.
Alun Wyn Jones previously warned that the loss of the region would leave a “rugby black hole” across the city.
The latest showdown has sent shockwaves through the game, with 51 clubs already moving to axe the WRU chairman in a vote of no confidence.
Cllr Stewart concluded: “Our national sport is in disarray, we need a change in leadership at the WRU quickly.”
The WRU has hit back at Cllr Stewart’s claims saying the notes released by the council were “not an accurate reflection of what was said”.
Meanwhile, Swansea West MP Torsten Bell has confronted the Welsh Rugby Union over the crisis.
