(CNN) -- Swaths of empty blue seats and a vacant overflow venue in Oklahoma have led President Donald Trumps aides to begin debating what his signature campaign rallies will look like going forward, people familiar with the matter say. Now, it remains unclear when -- and how -- Trump will move forward with his flagship political events. Instead of departing Tulsa with a boost, Trump appeared deflated as he returned to the White House with his tie hanging loose around his neck. Few people around Trump believe rallies will be eliminated altogether. Trump has convened smaller rallies in the past, particularly as he campaigned during the 2018 midterm elections.