Sen. Claire McCaskill (D-Mo.) tweeted that "the top of my head is about to pop off" during a hearing regarding defense contracting reform.

The oft-tweeting senator made her animated comment during a Senate Homeland Security Committee hearing featuring witnesses from the Department of Defense and the Government Accountability Office (GAO):

Gonna be some tuf ?s for witnesses in a few at this hearng. Unbelievable problms at Def Contrctng Agncy. Top of my head is about to pop off.

A recent GAO audit found that the Defense Contracting Audit Agency is experiencing difficulties overseeing multi-billion dollar defense contracts. Homeland Security Committee chairman Sen. Joe Lieberman (I-Conn.) told the AP yesterday the DCAA needs "a complete cultural transformation."