1. Between vaccinated people and those who have immunity from recovery - I'm a twofer - the US is in the "Herd Immunity" zone. IOW, the risk from infected illegals is not very high, especially with the Feds' inefficiency in sprinkling them around the country. By the time those who didn't die arrive wherever, they'll have recovered.
2. "Variants" are chimeric Panic Porn. The vaccines used in the US are known to be effective against known variants. And immunity from recovery seems to be as well.