Dozens of Jordanians have pelted the parliament with eggs, demanding the dismissal of the prime minister and all parliament members.
The police briefly scuffled with the egg-hurling protesters, after which the rally ended peacefully.
Protests inspired by Arab uprisings have spread to Jordan but on a lesser scale.
Thursday's protesters were angered that lawmakers this week cleared Prime Minister Marouf al-Bakhit of involvement in a casino scandal during his previous 2005-2007 term.
At the time, his Cabinet approved the country's first gambling house in violation of Islamic law.
The parliament implicated al-Bakhit's ex-tourism minister, but acquitted the premier. The protesters say al-Bakhit is also responsible. They plan more demonstrations for Friday.