Hogan and Kasich join Massachusetts Governor Charlie Baker and Michigan governor Rick Snyder, who have also stated they will not be supporting the presumptive Republican nominee.
Gov. Rick Snyder's aides discussed Flint's water quality problems as early as autumn 2014, with one calling the situation "downright scary."
The disclosure of the documents comes as Michigan's Republican Governor Rick Snyder faces pressure to resign over handling of the Flint water crisis.
Snyder, at Flint meeting: "There are a number of folk out there that are spending their time mainly on the political side and the blame side."
Legal expert says it would be a challenge to bring criminal charges.
Preliminary estimates of the cost of repairing Flint’s water distribution infrastructure range from millions of dollars to as high as $1.5 billion.
If there was ever any ethical foundation supporting the administration of Michigan Gov. Rick Snyder, it has been obliterated.