He added: "There was a deal between Liverpool and Knowsley councils, and Merseytravel, which was a good one, and it has been ambushed by the officers of the city council.
"They will never, in my opinion, be forgiven for this."
Merseytravel was also unhappy about the way the council had inserted new clauses into the funding agreement at last Friday's meeting, in particular, the apparent watering down of its enthusiasm for Line One of the tram scheme from being "committed" to merely "supportive".
Following yesterday's decision by Merseytravel, Liverpool council leader Mike Storey said: "The city council has never accused Mersey-travel of being a party to mislead and defraud the Department for Transport.
"The QC's advice considered by the council's executive board said that if the council were to sign the comfort letter without a due diligence exercise, it would be acting illegally. If Merseytravel want to take legal action, then clearly that is a matter for them and we would not wish to comment on that."