US President Donald Trump has begun rolling out a series of measures on immigration, and more announcements are expected in the coming days.
Mexican Border Wall:
* 2006 law gives Trump the authority to proceed with construction but he'll need billions of dollars from Congress.
* He says Mexico will ultimately pay for the wall, but Mexico insists it won't.
* Environmental groups and some landowners expected to fight it.
* Will have to adhere to a 1970 treaty barring structures that disrupt the flow of rivers across the border.
Sanctuary Cities:
* Crackdown on cities that don't co-operate with federal immigration authorities, stripping them of federal grant money.
* May face legal challenges to any efforts to force co-operation.
* Some federal courts have found local jurisdictions cannot hold immigrants beyond their jail term or deny them bond based only a request from immigration.
* In October, a federal court in Illinois ruled that the government needed a warrant to take custody of immigrants held in local jails.
Catch-and-release:
* Trump to end the practice of federal agents releasing some immigrants caught at the Mexican border.
* Trump will have to address the issue of jail space.
* Another challenge is what to do with children caught crossing the border with their parents as a government currently barred from jailing child immigrants.
Immigration Personnel:
* Trump to add 5000 Border Patrol agents and triple the number of Immigration and Customs Enforcement agents responsible for finding and removing deportable immigrants.
* Needs additional funding from Congress at a time of growing deficits.
Criminal Immigrants:
* Trump to focus on deporting immigrants with criminal records.
* But they evade authorities and are difficult to find.
Reporting criminal immigrant activity:
* Trump pledged to publish a weekly list of crimes committed by immigrants and of jurisdictions that don't comply with government requests to detain immigrants who could face deportation.
* Objections are likely from jurisdictions adhering to local laws or court rulings and from civil libertarians.
