“I don’t legally if this is possible, regardless of the outcome of the election what happens if Biden issues a blanket pardon for everyone who has entered the US illegally, making it impossible for a Trump Administration to deport them.”
If according to Democrats illegals aren’t criminals, then there is no reason to pardon them.
Perhaps, one of Trump’s campaign promises is mass deportations of illegals, if they are all of a sudden pardoned, there is no legal justification to deport them unless they commit additional crimes once they are living in the country.
Reading about this concept, Obama was urged to pardon all illegal aliens before he left office and declined, Biden has let in millions more, he will be put under pressure to issue and blanket pardon, I think he’s likely to do that around Jan 20, 2025.