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Hello, and welcome to NewsHour LIVE from the BBC World Service.
In London, I'm Rebecca.
Rebecca Kesbi.
Now, when Donald Trump was sworn in as US President earlier this week, one of his first announcements was to send 1500 US troops to the southern border with Mexico.
That is to boost the 2,500 already there.
They're being tasked with installing barriers and infrastructure.
Today, though, an internal memo seen by our partners, CBS News, suggested that 10,000 troops could actually be deployed there.
Immigration was a signature theme on the Trump campaign, so it was no surprise when it appeared in his inaugural speech.
First, I will declare a national emergency at our southern border.
There we go.
Well, we're joined now live by Naomi Rucham, who's a correspondent for CBS News.
She's in New York at the moment.
Naomi, thanks for coming on.
First of all, can you tell us a little bit more about what was in this memo, who it was to, and what kind of information it gives us about the Trump migration plan?
Well, Rebecca, good to speak with you.
It certainly expands what we had already heard just this week from President Donald Trump in that executive action that Trump had signed earlier this week.
On Monday when he took office, he did declare it a national emergency along the southern border.