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The top 5 stories you need to know this morning

The top news stories you need to know today: Republicans vow to fight the Iran deal, NASA's New Horizons probe sends signals back from Pluto, and more.

A handout picture made available by NASA shows Pluto nearly filling the frame in the Long Range Reconnaissance Imager (LORRI) aboard NASA's New Horizons spacecraft, taken on July 13, 2015. (Photo by NASA/APL/SWRI/EPA)
A handout picture made available by NASA shows Pluto nearly filling the frame in the Long Range Reconnaissance Imager (LORRI) aboard NASA's New Horizons spacecraft, taken on July 13, 2015, when the spacecraft was 476,000 miles (768,000 kilometers) from the surface. EPA

Nisha Chittal

Brian Walsh