Joint opposition has submitted no-confidence motion against Speaker National Assembly Asad Qaiser.
Lower House of Parliament is meeting today to vote on no-confidence motion against Prime Minister Imran Khan.
Pakistan Tehreek-e-Insaf party (PTI) effectively lost its majority in the 342-member assembly last week when a coalition partner said its seven lawmakers would vote with the opposition.
More than a dozen PTI lawmakers have also indicated they will cross the floor. The opposition needs 172 votes for the motion to succeed.