The key graf in the Menendez illegal-immigrant-sex-offender-intern story:

Authorities in Hudson County notified ICE agents in early October that they suspected Sanchez was an illegal immigrant who was a registered sex offender and who may be eligible to be deported. ICE agents in New Jersey notified superiors at the Homeland Security Department because they considered it a potentially high profile arrest, and DHS instructed them not to arrest Sanchez until after the November election, one U.S. official told the AP. ICE officials complained that the delay was inappropriate, but DHS directed them several times not to act, the official said.

Mustn’t embarrass members of the Inner Party.