No, Canada negotiated changes within the treaty framework.
The US could do that (and some of the coverage have indicated that the withdrawal is a negotiating tactic to provide more leverage for that, with the plan being to leverage the time it takes to go into effect to negotiate changes and then cancel the withdrawal before it is effective; Canada didn't have to do that to negotiate changes, though.)
They could, they did[1], and it didn't work out.
[1] "U.S. officials said the administration sought to revise the treaty in September and was rebuffed by other nations, prompting the decision to withdraw."
The US could do that (and some of the coverage have indicated that the withdrawal is a negotiating tactic to provide more leverage for that, with the plan being to leverage the time it takes to go into effect to negotiate changes and then cancel the withdrawal before it is effective; Canada didn't have to do that to negotiate changes, though.)