Ontarians who are upset about Premier Doug Ford's move to overrule a court decision can protest, speak up in the media and put pressure on their MPPs, constitutional law experts say. There are no other tricks left in the book to stop him. Some reporters and politicians speculated on Monday that Prime Minister Justin Trudeau could invoke a "disallowance" clause of the Constitution Act of 1867. It says that a governor general can annul laws within two years of Royal Assent.

Since Ford has thrown us into a constitutional crisis by invoking "notwithstanding clause" to override a judicial ruling that rendered #Bill5 unconstitutional. Now is a good time for the PM to use s.90 of the Constitution Act, to "disallow and reserve" provincial legislation. pic.twitter.com/M7t4o1koMf — Kristyn Wong-Tam (@kristynwongtam) September 10, 2018

constitution also makes clear feds can use disallowance, so by our AG's logic, province would be a-ok with the feds using it simply because they can. (I'm not advocating for the feds to get involved, just pointing out simply being able to do something doesn't mean you should) https://t.co/QsePkGhjZ0 — Supriya Dwivedi (@supriyadwivedi) September 10, 2018

"Forget that," University of Toronto professor Nelson Wiseman told HuffPost Canada in an interview. "I'm not even sure it's technically possible. You'd have a major constitutional crisis." Disallowance is what's known as a "spent power." Spent powers are technically on the books, but they're so old they cannot be used. A federal government last used disallowance in 1943. "It's like thinking that the Governor General can decide she wants to appoint you the next prime minister and dismisses Justin Trudeau," Wiseman said. "The constitution says she can do that, can't she? But would anybody stand for it?" Story continues after video This issue should have stayed in the political realm and out of the courts all along, University of Waterloo political science professor Emmett Macfarlane suggested. "The law is no longer much of an option," he told HuffPost Canada. "Canada has this tendency to over-rely on courts to settle everything. Perhaps this is a good example to maybe reinvigorate our politics." Ford has a majority government. The bills his MPPs pass will become law whether people like it or not, Wiseman said. "The penalties have to be political. If people are so upset, you vote against him," he said. "Remember what he did four years from now."

Cole Burston/CANADIAN PRESS The podium is seen empty as Ontario Premier Doug Ford delays his news conference in Toronto on Sept. 10, 2018.