The Secret Service identified a building used by the would-be assassin of former President Donald Trump as an “area of concern” almost a week before the shooting at his rally in Pennsylvania. This came out during a briefing of Congress by the agency, Axios reported on Thursday. According to the report, the Secret Service also gave Congress a detailed timeline of the immediate leadup to the incident, including at 5:51pm, when they were first “notified of a suspicious person with a rangefinder on the outer perimeter,” and 6:10pm, when their counter sniper unit “informed [the] security room that …