[googthrowaway42]

"Heads on a pike" is a common expression.

"Eviscerate you and then hang you from your mother’s dining room ceiling by your intestines" is not.

[jacobolus]

“Heads on pikes” is used as a hyperbolic shorthand for any kind of public shaming, especially when someone is fired.

But “Mount their heads on pikes at the corners of the White House as a warning the way they used to do to traitors in Tudor England” is nothing close to a common expression.