no-confidence motion
A formal parliamentary motion to express loss of confidence in a government or minister.
野党は内閣不信任案を提出した。
The opposition party submitted a no-confidence motion against the cabinet.
不信任案 refers specifically to the written motion or bill of no confidence, whereas 不信任 is the abstract state or act of lacking confidence itself.
motion of no confidence against the cabinet
Compound of 不信任 (ふしんにん, 'non-confidence') and 案 (あん, 'proposal, motion').