measuring stick for new presidents. tonight we begin an in-depth look at the president's first 100 days, a five-part series that will run in this 5:00 p.m. hour. for our first installment, here is chief white house correspondent john roberts. >> i donald john trump do solemnly swear. >> there is no question president trump got off to a swift start on his first official day of business, signing three executive orders, fulfilling campaign promises to withdraw from the trans-pacific partnership trade deal, implement a federal hiring freeze and re-implement the so-called mexico city policy on funding ngos that provide abortion counseling. within the first week he green-lighted the keystone xl and dakota access pipelines, authorizeuildg a border wall and rebuilding the military, a issued his ill-fated executive order on the immigration ban which was immediately challenged in the courts. >> these entrenched interests will do anything they can to