President Donald Trump's "first buddy," Elon Musk, was seemingly everywhere in D.C. on Inauguration Day. Where (and with whom) was the billionaire?

From Trump joking, "We almost lost the First Lady" to Hillary Clinton's reaction to 'Gulf of America', here's all that stood at the ceremony.

During a speech at Capitol One Arena Monday following Donald Trump’s inauguration, Elon Musk appeared to deliver a Roman salute not once, but twice. The gesture is associated with Nazi Germany, and Musk was speaking triumphantly about Trump’s election victory when he made the salute.