So I just answered my own question. I was confused by this,

If those crossing claim asylum, the RCMP cannot send them back to the United States.

Because I thought the Safe Third Country Agreement allowed them to be sent back with no right to be heard for asylum (unless they stuck in and evaded detection for 14 days).

However, according to https://www.wilsoncenter.org/blog-post/safe-third-country-agreement-expansion-causes-asylum-seekers-explore-new-routes

Asylum seekers are arriving at airports with tourist visas and petitioning for asylum at immigration offices after their arrival. The number of asylum applications made at airports in Montreal and Toronto have tripled since the beginning of 2023.
Overall, the expansion decreased the flow of asylum seekers coming from the United States directly but has not worked to decrease the flow of asylum seekers into Canada.

So I guess to get into Canada they'd leave the US and fly in from another country somehow.

in migration into US since COVID started has spiked 2-3x... the main reason is changing demographics that are leading to labour shortages and wage pressures against the owner class.

nothing will be done... the meat packing in US heart land and delivery/taxis in cities need orphans to crush.

But trump bashing immigrants is provocative, it gets people going lol

Neither side ever checks the numbers tho

Which is ironic because the United States has been dealing with the reverse problem for at least two years now! People get to Canada and then walk across the northern border and grab a bus / cab / uber into New York. Cash Jordan, a youtuber in New York City, did a video on this earlier in the year.