Trump visits border as Democrats accuse him of sabotaging progress

SIERRA VISTA, Ariz. — Donald Trump is traveling to the shrub-dotted hills of Arizona near the U.S.-Mexico border to campaign Thursday on immigration, his signature issue since launching his first successful presidential bid nine years ago.

The visit is the fourth in a series of events held in battleground states this week to try to draw the focus away from Democrats' celebration of Vice President Kamala Harris' presidential nomination in Chicago. The Trump campaign placed a lectern with a sign that says “the southern border” on a dirt road between a border wall and piles of steel beams.