welcome back. we ve got our daily briefing on politics and a potential major shakeup at the white house. sources telling us at nbc news thisorning that president trump isreplacing reince pre b priebus as chief of staff. joining me now is mark murray. reince is not necessarily out, but it appears that the president is feverishly making calls and lining up potential replacements, gary cohen, the president s economic advisor and former president and coo of goldman sachs and david urban who was part of the trump campaign and was an advisor for quite some time now. who are you hearing is a front runner? what we are hearing is that what president trump has been doing is sounding out to his friends and others about potentially replacing reince