taliban. last month more bombs fell than any time over the last five years and the u.s. military is fast approaching the total number of bombs dropped in all of 2013. jon, just moments ago he was asked if the united states should withdraw from the iran nuclear deal. mattis answered no. he says the united states should remain a part of this landmark nuclear agreement at the trump administration faces an october 15 deadline. >> jon: thorny issues all around the globe. >> melissa: a massive investigation now underway into the las vegas massacre as authorities also look at how to prevent similar attacks. those details ahead. plus president trump is on his way to puerto rico after facing criticism for the federal response to the devastated island. we are live in san juan.