IRS lean on foreclosed house - IRS not notified.

[Jida D]

I put a bid on a foreclosed property and purchased it 4 months ago. What I found post purchase was an IRS tax lien on the property for $22 000. After doing further research, I found out that the IRS had not been notified and given consent, so the tax lien is still there.

The question: What are my options hereon to remove the tax lien?