<sod >Donald Trump has ended an Obama-era policy that has shielded nearly 800,000 young undocumented immigrants from deportation â but has called on Congress to pass legislation to let the so-called 'Dreamers' stay in the US.< eod>< sod > Donald Trump has ended a policy that has shielded nearly 800,000 young undocumented immigrants from deportation â but has called on Congress to pass legislation to let the so-called 'Dreamers' stay in the US.< eod>