'The Trump Effect' on US border patrols
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BBC Panorama joins a helicopter dawn patrol along the US border

BBC Panorama's Hilary Andersson joins a helicopter dawn patrol over the Rio Grande River, that forms the US border.

The president’s tough stance has created what they call here the "Trump effect".

Watch BBC Panorama: Trump's Fortress America on Monday 17 July on BBC One at 20:30 BST and afterwards on iPlayer.

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