A petard

From The Washington Post:

If Trump is found to have violated federal law in removing and retaining classified documents without authorization, he could be convicted of a felony punishable by five years in prison. And that conviction would be a felony carrying that punishment because of a law signed by President Donald Trump.

A nice way to illustrate the idea of poetic justice. Also the idea of being hoist with one’s own petard.

[Hoist? The past participle of hoise.]