Construction begins on Trump's border wall prototypes

The first steps in what President Donald Trump hopes will be a new era in border security began Tuesday when construction crews broke ground on prototype designs for a border wall, starting a 30-day sprint to construct eight examples in a fenced-off area on Otay Mesa.

Amid heavy security from state, local and federal agents wary of potential large-scale protests against the controversial project that have not materialized, four of the six private companies that won a national competition to build the designs began work in the morning.