U.S President Donald Trump tours a section of U.S-Mexico border

U.S. President Donald Trump tours a section of the U.S.-Mexico border wall in San Luis, Arizona, Tuesday, June 23.

Trump praised what he described as a “powerful and comprehensive” wall along the nation’s southern border Tuesday, highlighting one of the key promises from his successful election campaign four years ago to secure the U.S. borders.

A day after ordering tighter restrictions on a variety of visa categories, Trump visited a new section of the border wall in the southwestern U.S. state of Arizona. After signing a plaque on the imposing slatted black wall at San Luis, the president, in response to a question from VOA described the new construction as “really foolproof.”

Trump, who is seeking re-election in November, said on Tuesday as much as 760 kilometers of border wall could be completed by the end of the year.