Bush loyalists are attempting to use Clinton’s removal of the Bush-appointed USAs in 1993 as an example of similar behavior, but it just ain’t so. All presidents replace the USAs when they take office; they’re appointed to 4-year terms, so that’s not at all surprising.
The wacky part here is the idea of FIRING them in the middle of a term. Bush appointed these attorneys in the first place. And, curiously enough, several were involved in high-profile prosecutions of GOP lawmakers (e.g., Duke Cunningham) that were making waves for the Administration and the GOP in general. This is far more like the Saturday Night Massacre than the routine changing-of-the-guards that accompanies the shift from one administration to the next.
See more here and here. Oh, and here’s another bit on how Bush’s dismissal of a USA resulted in the halt of an investigation into . . . Jack Abramoff. Whups!