Immigration is one of the most complex and debated issues in contemporary American politics. It is often highly contentious, which demonstrates how significant the issue is to a large percentage of the population

The liberal position is one in support of legal immigration. In addition, liberals support a path to citizenship for those individuals already residing in the country illegally and believe that it would be unfair and unrealistic to arrest and deport millions of undocumented immigrants.

Like liberals, conservatives are in support of legal immigration. Conservatives, on the other hand, do not support amnesty for those immigrants that are already in the country illegally. The conservative position is that the borders should be secured before there is any talk about a pathway to citizenship

You can read up on the immigration issue here:

• A collection of bullet points that highlight the positions taken by some of the leading republican and democratic lawmakers was collected by the website On The Issues.
Ballotpedia has a good basic overview of the 2016 presidential candidate’s positions on the issue of immigration.
The National Academies of Sciences, Engineering, and Medicine published one of the most comprehensive recent studies on the economic and fiscal consequences of immigration on Thursday, September 22, 2016.
The Department of Homeland Security collects and releases detailed immigration statistics.
• A Yearbook on immigration statistics from 2004 through 2014 can be also be found on the DHS website.
• The most frequently asked questions on immigration statistics in the United States are answered by the Migration Policy Institute.
The United States Citizenship and Immigration Service receives approximately 6 million petitions and applications annually from individuals and businesses. The data on these applications is published on their website.
• The U.S. Immigration and Customs Enforcement (ICE) is tasked with the removal operations of immigrants in the United States. Their removal statistics are published annually.
• A detailed, in-depth study on the costs and benefits of immigration was published by the Brookings Institute in July of this year.
• A brief history of American immigration law can be found here.
Pew Research Center published an article on how U.S. immigration has changed throughout history.
• A collection of the articles published by the New York Times on immigration.
• A collection of articles published by the Wall Street Journal on immigration.