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BOULDER, Colo. (AP/KDVR) — The University of Colorado Boulder has announced that visiting former California professor John Eastman is no longer permitted to perform outreach or speak after giving a speech for then-President Donald Trump shortly before the Jan. 6 attack on the U.S. Capitol.

Eastman performed activities as a representative of the Benson Center for the Study of Western Civilization.

The Daily Camera reported that the university said Eastman alleged widespread election fraud during his speech without providing evidence.

Eastman told the university it violated his constitutional rights and he would be “exploring all options.” Eastman retired from Chapman University on Jan. 14.