There are procedural issues that make that difficult currently. For example, undocumented immigrants can claim asylum and then legally can’t be deported until their claim has been processed and rejected. And this takes a very long time due to a shortage of immigration judges. There actually was a bill introduced under biden that would have limited the circumstances in which asylum can be claimed, and added funding for more immigration judges. But Trump called republican congresspeople to encourage them to vote against the bill because he didn’t want anyone else to get the credit for improving border security.