New letters showing tensions between the HSE and the National Public Health Emergency Team have been described as explosive by the Labour leader.
In one of the letters HSE boss Paul Reid expresses anger that NPHET announced an expansion of Coronavirus testing to 100,000 a week, without informing the HSE which carries out the tests.
Despite the government repeatedly denying any rift in the Coronavirus decision making process, new letters paint a different picture.
In mid-April the Chief Medical Officer and Chair of the National Public Health Emergency Team Tony Holohan announced a target of 100,000 tests being carried out a week.
It's now emerged that was done without the sign off of the HSE.
HSE boss Paul Reid subsequently wrote to the head of the Department of Health, expressing concerns at the decision making process.
The HSE carries out the testing, and Mr Reid said he was extremely dissapointed that understandings around decision making were not respected.
He raised further concerns about the ability of the HSE to meet those targets.
In the Dáil Labour leader Alan Kelly called the letters explosive.
Health Minister Wicklow TD Simon Harris tried to play them down, saying a number of HSE staff are on the NPHET team that made the decision, and that there's always robust debates around decisions at this level