The Democratic Party should release the following statement:
We are alarmed by the threats and the pressure that Donald Trump is applying to Canada. We could not have asked for better allies, and we could not have better neighbors to the North. We would welcome Canada as our 51st state IF Canada chooses to join us without pressure and under its own volition.
But we also recognize Canada as a proud country with its own history and culture and can understand why Canadians would want to maintain their independence from the United States.
If Canada decides to join us as the 51st state, whether because it is forced to or because it wants to, we welcome them with open arms and ask them to send its two Senators and over 50 representatives to Congress as proud new members of the Democratic Party.
Let's see whether Trump will still continue trying to coerce Canada into becoming the 51st state after that announcement, and whether Republican members of Congress will criticize Trump if he continues his threats.