White House hopeful Marianne Williamson Marianne WilliamsonMarianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 Marianne Williamson: Democratic convention 'like binge watching a Marriott commercial' MORE is urging her followers to contact members of Congress to voice their opposition to Charles Kupperman, a possible replacement for recently-ousted national security adviser John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE.

“Good news John Bolton was fired. But the man now poised to at least temporarily fill his position is someone whose views lie somewhere between dangerous & insane. Make noise! Call reps at (202) 224-3121 (House & Senate) and say NO to Charles Kupperman,” Williamson tweeted Friday night.

Good news John Bolton was fired. But the man now poised to at least temporarily fill his position is someone whose views lie somewhere between dangerous & insane. Make noise! Call reps at (202) 224-3121 (House & Senate) and say NO to Charles Kupperman. https://t.co/WtE6bYW5nH — Marianne Williamson (@marwilliamson) September 14, 2019

Williamson later tweeted to clarify that "Of course a National Security Advisor does not need Senate confirmation" while urging followers to still contact members of Congress to voice their opinion.

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"The President appoints the National Security advisor at his/her pleasure. But that is no reason for us to remain quiet. Writing Op Ed’s, calling our reps, using our voices. That’s what matters: speaking up," she tweeted.

Trump fired Bolton this week, citing strong disagreements with “many of his suggestions.”

A host of Republicans have been floated as possible replacements. But whichever candidate Trump picks will be appointed, rather than nominated and then subjected to confirmation in the Senate.

Williamson campaign manager Patricia Ewing said in a statement to The Hill that the Democratic presidential hopeful "is using the rules of advocacy perfectly."

"Asking people to call Congress to put pressure on the White House to oppose a hire or appointment is a very smart strategy. It’s called advocacy - - with a little politics thrown in," she said.

Williamson in her initial tweet was responding to a Huffington Post report revealing that Kupperman said in the 1980s that nuclear conflict with the Soviet Union was winnable.

Kupperman, who has filled Bolton’s vacancy in an acting capacity, is reportedly being considered to serve as national security adviser on a permanent basis.

– This story was updated Sept. 14 at 6:17 a.m. to reflect Williamson's additional tweet