New Delhi, Feb. 12 -- Congress is almost certain to formally push back against President Donald Trump's signature economic policy, as the House of Representatives looks poised to approve a resolution revoking tariffs on Canada as soon as Wednesday. Though the resolution has no chance of going into effect, it is the latest sign that Trump's power is eroding.

On Tuesday evening, three Republicans joined Democrats to block a rule that would have barred the House from voting on the Canada resolution and others like it. The resolution, offered by Rep. Gregory Meeks (D., N.Y.), would end the levies Trump imposed by executive order on Canada last February. The GOP members who joined Democrats on Tuesday's procedural vote are expected to join th...