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The 42-year-old former Royal Marines Commando admitted sometimes "motivation can be quite hard" and he "can feel quite negative".

Marines, serving in Afghanistan and Iraq.

We sit over here in our homes in the United States ordering pizza and watching Netflix and putting the kids to bed and getting ready to go to work in the morning, and overseas, soldiers and sailors and airmen and Marines are in harm's way just by the jobs that they do.

A gate in the barrier opened and Border Patrol, Marines and Army officials showed reporters how both fences were now sheathed in concertina wire.

“What we see behind us here today is the result of a true whole-of-government effort, from the Marines laying down miles of concertina wire along the border infrastructure, to the soldiers manning our scope trucks and remote video surveillance cameras,” he said.