It's kinda incredible that a story like this is not really attracting all that much attention. But that's what happens when you put in a narcissistic lying idiot in the Oval Office:
The New York Times, citing half a dozen sources, reported that an altercation in February between White House Chief of Staff John Kelly and Corey Lewandowski turned physical, requiring the Secret Service to intervene in the episode outside the Oval Office.
According to Maggie Haberman and Katie Rogers, the near-brawl happened after a joint meeting between the men and President Trump. After a shouting match, Kelly grabbed Lewandowski by his collar and tried to push him against a wall. Lewandowski did not get physical, and the two men agreed to move on after Secret Service agents appeared on the scene.