As far as Mulroney was concerned, the big problem was corruption and Ministers being forced to resign, not fractions in the Conservative Party. The Liberal Party under Chretien was also solid until Paul Martin started his push to become leader and PM and split the party right up the middle. The CPC under Harper was ruled with an iron rod and no dissension was possible. Only Brent Rathgaber and Jim Prentice left the party, the rest applauded anything that Harper proposed. Trump's situation is far different from any of those governments, he has absolutely no political smarts and inherited a severely fractured party, he cannot succeed. Martin's failure was somewhat self-induced, he should never have split the party and he should certainly not have called the Gomery Inquiry, Harper used that as an admission of guilt as did the electorate.