The President has significant influence on how border security is conducted, as evidenced by the recent effect of Trump's executive order which has been covered

The President has significant influence on how border security is conducted, as evidenced by the recent effect of Trump's executive order which has been covered extensively in the news. Many/most readers will associate this event with Trump. Incidentally, how do we know when this event happened? The photo is labeled December, but its essentially a stock photo.