Nobody will cover it.

1. Bank won't remove this lien because the IRS lien is superior. 

2. Title insurance usually include separate "exceptions" to coverage.  This "exceptions" includes all the liens insurance company found during title search and they are not covered by the title insurance. 

I would think the IRS lien would appear in this "exception".   See schedule B-2 in this document.

https://www.gofirstam.com/resources/real-estate-agents/what-to-look-for-on-the-title-commitment.html