A day after breach of trust charges were stayed against the Canadian military's former second-in-command, the federal opposition parties are calling for a parliamentary investigation into what they say was political interference in the case by the Trudeau Liberals. Conservative defence critic Erin O'Toole says a lot of questions about why Vice-Admiral Mark Norman was charged in the first place need to be answered. At a news conference Wednesday, Norman's lawyer Marie Henein alleged the Liberals interfered in how the case proceeded by withholding key documents and information that could have helped him demonstrate his innocence.