Kellyanne Conway, 53, is expected to net the biggest advance ever for a Trump tell-all, sources told DailyMail.com

It is expected to dwarf the $2M paid to ex national security adviser John Bolton

Conway could earn tens of millions more from the movie rights, according to the insider 

 The outgoing President's once-closest advisor will deliver the most 'unvarnished' account to date of Trump's four tumultuous years in power

'Of all the White House insiders, Kellyanne is going to write the most unvarnished, eye-popping account of working for the president,' a source said

They added:  'She's got some of us quaking in our boots'

Her upcoming book is also expected to lay bare the devastating rift between Conway and her husband George and their rebellious daughter Claudia  

Conway sparked a bidding war after unexpectedly stepping down from her role on the eve of August's Republican National Convention