In raising the question of privilege, Philpott wants House of Commons Speaker Geoff Regan to rule on the matter in the name of "procedural fairness", though it remains unclear whether that's within his jurisdiction.
Philpott and Wilson-Raybould resigned from cabinet over the SNC-Lavalin scandal.
While Nutson said she will still vote Liberal in the next election, Philpott's ejection from caucus has killed her motivation to put long hours and energy into volunteering for the campaign again this year.
Philpott said she wanted the rules clarified so that MPs' rights, constitutional convention and the rule of law are upheld.
In recent weeks, the Liberal majority has scuttled a House of Commons Justice Committee inquiry into the SNC-Lavalin case and blocked the House ethics committee from investigating.
She has testified that she faced relentless pressure last fall from Trudeau, his office, the top public servant and others to override the director of public prosecutions, who had decided not to invite the Montreal engineering giant to negotiate a remediation agreement, a kind of plea bargain.
However, the new rules also left it up to caucus members, at their first meeting following an election, to decide whether to opt into the Chong reforms.
Philpott said that because she and Wilson-Raybould were expelled, the situation is unique.
During a point of personal privilege in the House of Commons, Philpott noted the Parliament of Canada Act says MPs can't be kicked out of their party groups without a vote and Trudeau ejected them on his own. "However, the decision had been already made".
"Expulsion should not be his decision to take unilaterally, however the decision had been already made", Philpott said, referencing Trudeau's comments to the national caucus that were televised last Tuesday when he announced their ouster.
Regan told Philpott he would consider her argument and report back to the House later.
Justin Trudeau says his threat to sue Conservative Leader Andrew Scheer is about making sure there are consequences for lying in politics - but he's not saying if he intends to make good on it. "It was my decision to make but the fact that the caucus was clear and united on that made my decision easier".
Scheer is standing by his statements, and has dared Trudeau to follow through with the suit.
Canadian Prime Minister Justin Trudeau speaks during a news conference in Ottawa, Ontario, Tuesday, April 2, 2019.
Trudeau went on to say he's not going to put up with it.