new signs today that the mueller probe could be close to wrapping up. a source close to deputy attorney general rod rosen tine telling nbc news he plans to stay on until mueller submits his report. that comes as reports circulated yesterday that rosenstein would leave once a new attorney general is sworn in. let's bring in the former deputy assistant attorney general and betsy woodruff. she is also an msnbc contributor. rosenstein reportedly ready to step down. this new reporting says he'll stay on until the probe is over. you know rob rosenstein. what's behind his decision? >> i would say exhaustion first and foremost. a normal deputy attorney general serves 18 months. he did two years. they say that it's a marathon,