WASHINGTON — John Kelly, mired in conflicts with a widening array of officials from the National Security Council to the office of the first lady, may soon depart the Trump administration, according to seven people familiar with the discussions. Nick Ayers, Vice President Mike Pence’s chief of staff, is among those being considered for the job, three of the people said, though President Donald Trump has mused about other possible candidates. Melania Trump has ensured the departure of one White House official, deputy national security adviser Mira Ricardel , after she had a series of run-ins with the first lady’s office. Stephanie Grisham, the first lady’s communications director, issued a pointed statement on Tuesday saying as much. “It is the position of the Office of the First Lady that she no longer deserves the honor of serving in this White House,” Grisham said. It’s an extraordinary, if not unprecedented, move for the first lady’s office to publicly call f...