I don't even know how this would work, but basically as a libertarian I started as against borders because they are government-created boundaries
Then I recognized that without borders it seemed difficult to decide who was and wasn't a citizen and that wasn't fair, and that it seemed like certain people in government wanted to bring in more people to get them to vote to destroy freedom, so actually the libertarian position would be for borders to protect freedom
However, now with covid we also see borders being used to prevent people from moving - some people have been stuck in countries they attempted to live in temporarily or were on vacation at, or haven't been able to visit countries because of border restrictions
The libertarian (ancap) position on borders is that private borders are fine (like, on land that a person owns, they can choose who can "immigrate" to it or not, or like private cities can decide who is allowed to visit)
So are any conservatives against borders or what do you think of this issue in light of recent developments?
Define your beliefs by thinking them through on their own merits. Forget about trying to be aligned with a group think. With that said, can you imagine the economic, cultural, social fallout of allowing anyone to come into the US freely? In very short order the systems that the majority of people were seeking would collapse. Crime would rise exponentially. Healthcare systems would be overwhelmed. Housing markets would be consumed and prices would rise. Food production would lag behind demand. People would be hungry, homeless, scared, and angry. Oh wait, all of that is happening with only the ones that can sneak in now.