Mitch McConnell's invocation of Rule XIX after the Heritage Foundation advocated for just that seems…suspicious.
The Heritage Foundation, that cesspool of conservative ideas that is still hanging on, published a primer last month explaining how the Senate majority—Republicans—can silence any dissent from the minority—Democrats—by "strictly enforcing" Rule XIX.
Given the Foundation's close working with the Trump campaign, transition team, and now administration, this seems not coincidental at all.