“Ours is a nation of immigrants. We're also a nation of law. Unfortunately, the United States has not been in complete control of its borders for decades and, therefore, illegal immigration has been on the rise. We have a responsibility to address these challenges. We have a responsibility to enforce our laws. We have a responsibility to secure our borders. We take this responsibility seriously.”

Carter: President Trump Made Right Move on DACA https://buddycarter.house.gov/news/documentsingle.aspx?DocumentID=2350 (September 5, 2017)

2000s, 2008, Address to the United Nations General Assembly (September 2008)

State of the Union address http://millercenter.org/president/clinton/speeches/speech-3440 (24 January 1995)
1990s
Context: All Americans, not only in the States most heavily affected but in every place in this country, are rightly disturbed by the large numbers of illegal aliens entering our country. The jobs they hold might otherwise be held by citizens or legal immigrants. The public service they use impose burdens on our taxpayers. That's why our administration has moved aggressively to secure our borders more by hiring a record number of new border guards, by deporting twice as many criminal aliens as ever before, by cracking down on illegal hiring, by barring welfare benefits to illegal aliens. In the budget I will present to you, we will try to do more to speed the deportation of illegal aliens who are arrested for crimes, to better identify illegal aliens in the workplace as recommended by the commission headed by former Congresswoman Barbara Jordan. We are a nation of immigrants. But we are also a nation of laws. It is wrong and ultimately self-defeating for a nation of immigrants to permit the kind of abuse of our immigration laws we have seen in recent years, and we must do more to stop it.

2010s
Source: Statement by Senators McCain & Graham on Executive Order on Immigration (27 January 2017) from the Office of Senator John McCain http://www.mccain.senate.gov/public/index.cfm/2017/1/statement-by-senators-mccain-graham-on-executive-order-on-immigration regarding [Donald J. Trump]'s Executive Order 13769 entitled "Protecting the Nation from Foreign Terrorist Entry into the United States", as quoted by Jacob Sallum from Reason magazine in Here Is What Republican Critics of Trump's Immigration Order Are Saying on January 31, 2017 http://reason.com/blog/2017/01/31/here-is-what-republican-critics-of-trump

2000s, 2004, Signing of Secure Fence Act of 2006

MSNBC, April 2007 http://www.youtube.com/watch?v=lxSe69YehvY
2000s, 2006-2009

Day of Affirmation Address (1966)
Context: The help and the leadership of South Africa or of the United States cannot be accepted if we, within our own country or in our relationships with others, deny individual integrity, human dignity, and the common humanity of man. If we would lead outside our borders, if we would help those who need our assistance, if we would meet our responsibilities to mankind, we must first, all of us, demolish the borders which history has erected between men within our own nations — barriers of race and religion, social class and ignorance.
Our answer is the world's hope; it is to rely on youth. The cruelties and the obstacles of this swiftly changing planet will not yield to obsolete dogmas and outworn slogans. It cannot be moved by those who cling to a present which is already dying, who prefer the illusion of security to the excitement and danger which comes with even the most peaceful progress. This world demands the qualities of youth: not a time of life but a state of mind, a temper of the will, a quality of the imagination, a predominance of courage over timidity, of the appetite for adventure over the love of ease.

BBC obituary (2004)

2010s, 2015