Stephen Colbert is on a mission to take Kanye West down.

He wants everyone to buy his Christmas album, A Colbert Christmas, which drops at 5 p.m. (ET) today, so he can kick Kanye West out of the top spot on iTunes.

And what do you know, Kanye West is not too happy about this.  He posted on Twitter this morning:

To see Stephen Colbert discussing this issue on his show, visit poponthepop.com.

If you want to know who Stephen Colbert is, click here.