President-elect Donald Trump made immigration a top issue in his campaign and now his promises from the campaign trail are about to be put to the test.
A look at immigration by the numbers:
Immigrants in the country illegally: about 11 million.
Criminal immigrants: As of 2012, the government estimated that 1.9 million immigrants were convicted criminals and could face deportation.
Criminal immigrants in the country illegally: The Migration Policy Institute in Washington estimates that about 820,000 of the criminal immigrants are here illegally.
Deportations under President Barack Obama: More than 2.5 million.
Deportation costs: Each deportation costs an average of about $12,500, according to a 2011 government estimate.
Immigration court backlog: More than 521,000 cases are pending in federal immigration court, according to the Transactional Records Access Clearinghouse at Syracuse University.
Immigrants ordered deported: 88,128 in 2015, according to Executive Office for Immigration Review at Justice Department.
Young immigrants protected from deportation by Obama administration: More than 741,000 people have been approved for deferred action, which shields them from deportation and authorizes them to legally work.
Border Fence: About 650 miles of fencing is already in place along the Mexican border in parts of Texas, New Mexico, Arizona and California.
Length of Mexican border: Roughly 2,000 miles.
Border Patrol agents: 18,321 agents patrol the U.S. border with Mexico.
Arrests at the border: 408,870 people were arrested trying to cross the border illegally during the 2016 budget year that ended in September.