What is ‘motion to vacate’ – the procedure to oust Speaker McCarthy?

Hardline Republican Matt Gaetz says he will move to eject House speaker over deal with Democrats to avert shutdown

The Republican US House of Representatives speaker, Kevin McCarthy, faces an attempt by members of his own party to oust him because he passed a stopgap funding measure with Democratic support to avoid a government shutdown. Representative Matt Gaetz, a hardline Republican lawmaker, said he would file what's called the motion to vacate".