"So, please be specific of your view of "open border policy."
That's a question in and of itself. I obviously can't get into the headspace of the protesters, but it appears that they favor people in this country illegally being allowed to stay in the country illegally. Otherwise, what are they protesting?
US, like other countries, has different policies for different countries when it comes to entering the country legally. For example, you can come to Germany and stay for up to 90 days on a tourist passport. I think it's the same for Germans traveling to the US. But at 91 days, you're no longer legally allowed to be in the country. For immigrants, you generally apply for residency, which allows you to legally be in the country. This allows you to work, pay taxes, buy property, and receive government benefits.
Like I said, I have no idea what the expectations of the protesters are, but it appears that they believe the people who enter the country illegally should have the same rights as those who apply for and are granted residency.
"Strange times. The left is going to defend the 2nd amendment."
And Republicans are going to present the 2nd amendment as a threat to public safety. Albeit it seems a dwindling number of Republicans.
I think there will soon be an inflection point, where Republicans begin fleeing like rats off the sinking MAGA ship.