DHS seized some domain names a while ago claiming they were infringing copyright - but they had permissions from the artists, etc. The RIAA dragging its feet (among other factors) held up the judicial process and the cases festered. After over a year those domain names were released back to the owners, without any apology. Congress wants an explanation from DHS why it took so freakin' long.
It's encouraging that Congress is making moves towards limiting DHS' infringement on the First Amendment.
And, again I must point out:
YET ANOTHER REASON TO KEEP/UPHOLD THE CONSTITUTION.