The definition of preemptive is  something done in anticipation of another action or done to prevent something from happening. When the military takes action against forces they believe intend to do harm to them, this is an example of a preemptive strike.
Newsfront. Just 1 percent of illegal immigrants living in the United States last year were deported-a dramatic 25 percent drop from the previous year-a change the Obama Administration says is on purpose due to a shift in focus. illegal,immigrants,deported,drop. 400.
Q: Did Eisenhower deport 13 million illegal immigrants? Did Hoover and Truman use mass deportations to open jobs for U.S. citizens?A: No. Nothing close to 13 million persons were deported during any administration. All three of these presidents wrestled with a rising tide of illegal immigration,