Following the Journal's original report on the apparent feud between Ricardel and Melania Trump, the first lady's office condemned the top aide to national security adviser John Bolton in a stark statement.
President Donald Trump has been eyeing potential replacements for several senior positions in his administration - both inside the West Wing and across the Cabinet, multiple officials familiar with the matter said.
The sources did not elaborate on the clash over resources.
Grisham's statement was issued shortly after that event ended. At the time, the Reagan White House refused to acknowledge or comment on this tension between the two.
Nick Ayers, Vice President Mike Pence's chief of staff, is being considered to replace him among other candidates.
But even before the East Wing dust-up, Ricardel repeatedly tangled with Defense Secretary James Mattis, CNN reported - a rivalry that goes back to the presidential transition when she tried to block Mattis from hiring people who'd either been critical of, or insufficiently loyal to Trump.
250,000 flee raging wildfires across California
Officials said the fire has destroyed 6,453 homes and another 260 commercial structures and has grown to 404 square kilometers. On Sunday, officials confirmed that two deaths in Malibu were related to the Woolsey Fire , bringing the death toll to 25.
A source claimed Nielsen - who used to work on disaster management response for the White House under Bush - is referred to as a "Bushie" by Trump.
Trump has soured on Nielsen and White House chief of staff John Kelly, in part over frustration that his administration is not doing more to address what he has called a crisis at the U.S. -Mexico border, according to the people.
After last week's midterm elections, the Republican president was expected to make some changes as he prepares for the second half of his term in office.
Trump has seen a number of dramatic, high-profile resignations and terminations in the first two years of his presidency.
"There's no love lost between either of them", an anonymous administration official told ABC about Nielsen-Trump relations. He is scheduled to travel to California on Wednesday and Thursday to visit communities hit by deadly wildfires, the Interior Department said on Tuesday. It's possible her departure may lead to his, though he has said he will serve through Trump's re-election contest in 2020. "We're looking at that, and I do want to study whatever is being said", Trump told reporters last week. "All that has kept Nielsen on was not her loyalty to the president but desire to protect the department from his whims and to let her people do their jobs".