Initially remaining in New York following her husband's election victory, Melania has since assumed more traditional first lady roles that were at first carried out by Ivanka, prompting the suggestion that many staff members viewed Ivanka as the first lady.
Porter resigned earlier this month after his two ex-wives came forward with their accusations.
Hope Hicks, President Donald Trump's 29-year-old White House Communications Director, has really stepped out of the shadows in her role this year, after flying relatively under the radar in previous years.