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WASHINGTON, DC - JULY 25:  U.S. President Donald Trump holds a joint news conference with Lebanese Prime Minister Saad Hariri in the Rose Garden at the White House July 25, 2017 in Washington, DC. Trump began the news conference by announcing that Senate Republicans had passed a procedural vote on repealing Obamacare.  (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - JULY 25:  U.S. President Donald Trump holds a joint news conference with Lebanese Prime Minister Saad Hariri in the Rose Garden at the White House July 25, 2017 in Washington, DC. Trump began the news conference by announcing that Senate Republicans had passed a procedural vote on repealing Obamacare.  (Photo by Chip Somodevilla/Getty Images)

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    President Trump faces new military challenges

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President Trump faces new military challenges

As the US detects "highly unusual and unprecedented levels" of North Korean submarine activity, Russia prepares for a large scale military exercise on the border of NATO countries. CNN's Barbara Starr reports.

President Trump faces new military challenges

As the US detects "highly unusual and unprecedented levels" of North Korean submarine activity, Russia prepares for a large scale military exercise on the border of NATO countries. CNN's Barbara Starr reports.