The US President unexpectedly appeared for Kirstjen Nielsen's swearing-in as Homeland Security Secretary and reiterated his campaign pledge for a border wall with Mexico
It is a sign of the importance Donald Trump places on border security.
He wasn't expected to attend the swearing-in of his new Homeland Security Secretary on Friday.
But as his Vice President administered the oath to Kirstjen Nielsen - replacing John Kelly who became White House Chief of Staff - Trump had a familiar message to deliver.
"We're going to get the wall," he said.
"I know you want the wall. We're going to get the wall. If we don't get the wall, then you are going to have a lot of very unhappy people, starting with me. We're going to get the wall!"
As laughter rang out, Trump went on.
"And we need it. We need it for the drug flow; we need it for people coming into our country. And we want to have great people coming into our country."
Eight prototypes have been built for Trump's cherished border wall with Mexico and 'breachability' tests will determine which model is retained as the best barrier to illegal immigration.
As for the billions needed to put the plan into practice, the president has yet to receive the green light from Congress.