Chief of Staff John Kelly and national security adviser John Bolton reportedly got into a heated argument in the White House Thursday, sources told Bloomberg and CNN. Bloomberg reported that the “profanity-laced” exchange occurred outside the Oval Office. Two sources told CNN the argument was over the recent increase in border crossings, and that President Trump took Bolton’s side. Aides told Bloomberg that some staffers were worried one of the men “might immediately resign” over the argument, while another source characterized the blowup as a “falling out” in an interview with CNN. The network also reported that aides were concerned about either Kelly or Bolton leaving given their “deep disagreement over the border.” Sources told Bloomberg that Kelly and Bolton are not resigning.