Labour has said leader Ed Miliband was careful in his televised statement yesterday not to raise issues of Andy Coulson's character or the facts of the trial.
However, Mr Miliband did refer to the Prime Minister's former director of communications as a "criminal" - a fact "which had been established by the jury itself".
"It seems to us that these are matters between the judge and the Prime Minister," a senior Labour source said.
"We were reacting to the Prime Minister's statement. We were responsible in our reaction to the Prime Minister's statement," they added.