Given history, I'm less worried that they're illegal than if they were leftists

Historically nuclear espionage in this country has been conducted not by illegals but by citizens:  graduates of our most prestigious institutions of higher learning, no less.  My observation is that immigrants - illegal or otherwise love this country far more that the denizens of the Ivy League.

INSPECTOR GENERAL: Risk of Illegal Aliens Working With Nuclear Weapons. “The risk of such access is more than notional as demonstrated by the Office of Inspector General report ‘Security Access Controls at the Y-12 National Security Complex’ (June 2005) . . . which found that, in the past, illegal aliens had gained access to Y-12 on multiple occasions.”

hattip instapundit