Gunmen have killed up to nine members of a U.S. Mormon family, believed to be mainly children, in the latest massacre to afflict Mexico, family members said.

Acting Defence Secretary Patrick Shanahan is making his second trip to the U.S.-Mexican border to highlight what President Donald Trump calls a national emergency.

The Trump administration on Wednesday asked Congress for an additional $4.5 billion in emergency funds for the U.S.-Mexico border as it grapples with a surge of Central American migrant families seeking refuge in the U.S.

Hundreds of family members separated by the U.S.-Mexican border had an opportunity to meet for hugs and kisses on Saturday (June 24).

The wall could seal some Americans on the "Mexican side" - technically on U.S. soil, but outside of a barrier built north of the river separating the two countries.

Protesters took control of vehicle lanes at one of the busiest crossings on the U.S. border Sunday to oppose Mexican gasoline price hikes, waving through motorists into Mexico after Mexican authorities abandoned their posts.

Miriam Juarez, 35, pleaded guilty to bribing a U.S. border inspector in San Diego with cash and sexual favours for allowing people to enter the country illegally.