Liberal MP Marc Garneau is holding a news conference in Ottawa starting at 12 p.m. ET, with NDP Nycole Turmel to follow at 12:30 p.m. ET.
CBCNews.ca is carrying both events live starting at 12 p.m. ET.
The RCMP has charged Senator Mike Duffy with bribery, frauds on the government and 29 other charges related to Senate expenses, the awarding of consultant contracts and the acceptance of a $90,000 payment by the prime minister's former chief of staff.
More to come.