aplying for canadian TRV at port of entry?

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I reside in the US as a temporary worker and have an official visit to canada for a couple of days. I have a pending adjustment of status as well.

I read a single line in the canadian temporary resident visa guide that one can apply for this visa at a canadian port of entry if they are from the U.S. Is this true for non-US citizens?

thanks in advance for any help.