In his first week in office, O'Brien changed his position concerning the O-Train project due to an Ottawa Sun report that, were the project cancelled, there could be lawsuits from Siemens totaling up to $1 billion.
In his early days in office, O'Brien revised his opinion on the O-Train project after an Ottawa Sun article suggested that cancelling it might result in lawsuits from Siemens worth $1 billion.