Rep. Keith Ellison (D-MN) appeared on Keith Olbermann's Countdown Wednesday night to discuss Rep. Peter King's latest hearing on radical Islam.

During the hearing, King said that the Somalia-base Al-Shebab terror group was "a growing threat" to the United States. Ellison said on Countdown that not a single witness at the hearing backed up King's claim.

King earlier denied a request by Ellison to testify at the hearing. Ellison is the sole Muslim in Congress and represents a district that includes the largest Somali community in the U.S.

Olbermann concluded the interview by saying: "Congressman Peter King is un-American and frankly -- forgive the language -- he's an asshole."

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