Depends which kinds you're talking about. Work-visa immigration that imports workers to compete with U.S. workers should stop. And mass refugee resettlements should stop -- we don't need hordes of Sudanese, Hmong, etc. who are fish out of water here, culturally baffled and economically ranging from never-to-be-self-sufficient to competing with unskilled entry level U.S. workers for jobs. From an ethical standpoint, we ought to stop letting healthcare workers immigrate from third world countries which can't afford to lose them. On the other hand, workers with specific skills that we have an economic need for should be welcomed. Other than that, immigration should be limited to people who already have a job lined up here, and have an employer and/or personal sponsor to keep them off the dole (and send them back if they go on any kind of welfare within 10 years of arrival), and to legitimate family situations (NOT the recent real or phony marriages).
I'm talking ALL immigration.