Why Mark Kelly is trending

<p>Defense Secretary Pete Hegseth is again calling for Sen. Mark Kelly (D-AZ) to be investigated, this time over comments he made about US weapons stockpiles. CNN's Haley Britzky explains how Kelly has once again become a focus for Hegesth. Discover more videos, including live streams and exclusive storytelling, on our <a href="https://www.cnn.com/watch">Watch</a> page.</p>