Wrong!

Those countries who are vassals of U.S. foreign policies, which include Canada, have cause to fear if Trump screw up. They will pay for price for Trump mistakes. This is the price for being less than sovereign. 

Those countries who do conduct independent foreign policy, and are sovereign for real, have nothing to fear from Trump. But they had better prepare for military attacks from the U.S. I say prepare only, because actual war will not come. The UN Security Council will stop Trump, and U.S. domestic uprising will blow up society before Trump can order the first bomber strike. 

The world does not need reminding that American foreign policy is completely in the service of its military empire. And the generals only know one thing - foreign war. They have not done any defense for about 2 centuries.