FACTBOX-Democratic U.S. presidential hopefuls seek contrast with Trump on immigration

Candidates running for the 2020 Democratic presidential nomination have been uniformly critical of the immigration policies of U.S. President Donald Trump, who was elected after promising to crack down on illegal immigration and bolster enforcement along the U.S.-Mexico border.Here is a look at the immigration positions of Trump and the leading Democratic candidates looking to take him on in the November election.Since entering the White House in 2017, Trump has moved to end former President Bar