US President Donald Trump is expected to end the Deferred Action for Childhood Arrivals program (DACA), a policy introduced in 2012 that gives children brought to the US illegally the right to temporarily stay, study and work in the country. The repeal of DACA would be the latest in a series of controversial policy moves on immigration since his January 20 inauguration. CGTN looks back at the past few months of abrupt announcements and ensuing legal battles.