But his questions to both sides underscored the combustible and sensitive nature of immigration enforcement in a post-9/11 world.

Yet on the other side, cities like Chicago have announced they will avoid involving their police in issues that smack of federal immigration enforcement.

The President ought to be using immigration enforcement to address key priorities such as jobs and national security.

She has been nominated to be the assistant homeland security secretary for customs and immigration enforcement.

State and local participation in immigration enforcement have raised policy concerns.

But we've operated essentially with very little immigration enforcement.

However, it provides no general power for immigration enforcement by state and local authorities.

The effort marks a significant departure in the nation's approach to immigration enforcement.

On December 6, 2007, he released a nine-point immigration enforcement and border security plan.

To meet this goal, we must have stronger immigration enforcement and border protection.