The court of Wednesday committed Mr Salwai, two former ministers and a former MP to stand trial next month.
Daniel Yawah said Wednesday's decision was not a surprise.
All were facing corruption and bribery charges while Mr Salwai had also been charged with perjury.
The charges stem from a complaint by former opposition leader and now deputy prime minister, Ishmael Kalsakau.
Kalsakau claimed that in November 2016, the defendants bribed MPs to sign an ultimately failed motion of no confidence.
But Yawah was confident they would beat the charges.