Rep. Jason Chaffetz (R-Utah) isn't happy that Comedy Central's Stephen Colbert has been asked to testify at an upcoming House Judiciary subcommittee hearing on immigration.

"Seriously, the Dems have called him [Colbert] as an expert witness," he tweeted. "What a joke. All the serious issues and we have Colbert as an 'expert.'"

"I am a fan of Colbert, but immigration expert???" he continued.

A spokeswoman for the committee, which is chaired by Rep. Zoe Lofgren (D-Calif.), told the Daily Caller that Colbert's appearance will not be "a TV stunt." 

The hearing will begin at 9:30 am ET on Friday. Watch it live here