While addressing military members in Quantico, Virginia, on Tuesday, President Donald Trump pivoted from praising troops to commenting on stair etiquette—and used Barack Obama as an example. In his speech, Trump criticized President Biden’s physical stumbles, telling the crowd, “They looked at him falling downstairs every day. Every day the guy’s falling downstairs.” He claimed world leaders saw this and said, “It’s not our president. We can’t have it.” He then launched into...