[2] Historically, Liberal senators were part of the national Liberal Party parliamentary caucus, alongside MPs; this changed on January 29, 2014, when party leader Justin Trudeau expelled all 32 senators from the caucus.
The move came as a surprise to the Liberal senators, who were not informed the decision ahead of time.
[4] According to Cowan, the only change would be that they "will not need to be concerned any more about the real or perceived direction from the national Liberal caucus.
[8][n 1] On November 14, 2019, Day announced that the Senate Liberal Caucus was disbanding, with its current complement of nine members forming a new non-partisan parliamentary group called the Progressive Senate Group (PSG).
[2] Unlike the Independent Senators Group and the Canadian Senators Group, which impose either prohibitions or limits, respectively, on outside partisan activities, there was no mention that the new Progressive Senate Group would have similar limits; however, Day confirmed that, like the aforementioned two groups, the PSG would not have whipped votes, and the requirements of membership included supporting or holding "progressive" political values, support of the Canadian Charter of Rights and Freedoms, and supporting a new relationship with Canada's Indigenous peoples.