The Department of Justice blocked an early effort for a search where the "missing" back-up emails were kept.
http://dailycaller.com/2015/03/02/exposed-department-of-justice-shut-dow...
The Conservative Caucus is a public policy organization, contributions to which are not tax deductible. The IRS has determined TCC to be a 501(c)(4) organization, exempt from Federal income tax. TCC can receive corporate donations.