WASHINGTON -- Treasury Secretary Timothy Geithner blasted top U.S. financial regulators in an expletive-laced critique last Friday as frustration grows over the Obama administration's faltering plan to overhaul U.S. financial regulation, according to people familiar with the meeting.

The proposed regulatory revamp is one of President Barack Obama's top domestic priorities. But since it was unveiled in June, the plan has been criticized by the financial-services industry, as well as by financial regulators wary of encroachment...