By Sam Baker - 08/12/13 06:02 PM EDT
"While I have grave concerns about this law under any circumstance, Americans should not be forced into the exchanges, and certainly not without these assurances," McConnell wrote.
The data hub is designed to process applications for coverage as well as tax subsidies to help cover the cost of premiums.
The administration has said repeatedly that the hub will be ready on time for the exchanges to open on Oct. 1. and that its data will be secure.
But McConnell said the law should not be implemented quickly if security concerns persist.
"If you rush to go forward without adequate safeguards in place, any theft of personal information from constituents will be the result of your rush to implement a law to meet the agency’s political needs and not the operational needs of the people it is supposed to serve," he wrote.