Immigration was a top issue in his campaign, and President-elect Donald Trump’s promises are about to be put to the test. A look at immigrants in the U.S. by the numbers:

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Immigrants in U.S. illegally: about 11 million.

Criminal immigrants: As of 2012, government estimated 1.9 million immigrants were convicted criminals and could face deportation.

Criminal immigrants in U.S. illegally: Migration Policy Institute in Washington estimates about 820,000 of the criminal immigrants came illegally.

Deportations under President Barack Obama: More than 2.5 million.

Deportation costs: Average cost of each deportation is about $12,500, according to a 2011 government estimate.

Immigration court backlog: More than 521,000 cases pending in federal immigration court, according to Transactional Records Access Clearinghouse at Syracuse University.

Immigrants with pending deportation orders: 88,128 as of 2015, according to Executive Office for Immigration Review at Justice Department.

Young immigrants protected from deportation by Obama administration: More than 741,000 approved for deferred action, which shields them from deportation and authorizes them to legally work.

Border fence: About 650 miles of fencing already in place along U.S. border with Mexico, in parts of Texas, New Mexico, Arizona and California.

Length of U.S.-Mexico border: Roughly 2,000 miles.

Border Patrol agents: 18,321 agents patrol U.S. border with Mexico.

Arrests at border: 408,870 people were arrested trying to cross border illegally during 2016 budget year that ended Sept. 30.

(AP)