Republican presidential candidate Donald Trump repeated his hard-line immigration position in an hourlong appearance from his Florida country club Tuesday, even as Democrats highlight the racist rhetoric his campaign and allies have used to describe Latinos in the closing week of the presidential race.

The stakes are high.

The effort showed how social media and other technology can be leveraged to spread misinformation so quickly that those trying to stop it cannot keep up.

Increasing Latino interest and participation has been fed in part by an upswell of political organizing in Latino communities.