Treasury halts investment in retirement fund due to debt limit

Geithner warned lawmakers in a separate letter Monday that the government will no longer be able to meet all its obligations as soon as mid-February, and criticized any lawmaker seeking to use the nation's full faith and credit as a way to gain political leverage.

By law, federal employees will be made whole on any missed investments once the debt limit is increased, he added Tuesday.

"Federal retirees and employees will be unaffected by this action," he wrote.