There is a precedent for "drain the swamp" that is quite appropriate.

In the early late 1800s, there was a portion of Washington DC known as Swampoodle that was a swampy, rural part of the city occupied by hoodlums.

"The neighborhood gained a reputation for being a lawless shantytown, where crime, prostitution, drunkenness were rife during and after the Civil War."

It was replaced by Union Station in 1907.

https://en.wikipedia.org/wiki/Swampoodle_(Washington,_D.C.)