Former "Tonight Show" host Jay Leno says Republican presidential front-runner Donald Trump 's call for a ban on Muslims entering the United States violates the U.S. Constitution.<br />He said in Oslo Friday that the constitution "doesn't allow that type of nonsense, that kind of ridiculous talk that you bar people because of their religion."<br />He spoke at a joint news conference with singer Jason Derulo hours before the Nobel Peace Prize concert that Leno will host and where Derulo will perform.<br />Derulo called Trump's suggestion a "ridiculous statement and I don't think anybody takes this seriously."<br />The Tunisian National Dialogue Quartet received the prestigious Nobel Peace Prize Thursday for its "decisive contribution to the building of a pluralistic democracy in Tunisia in the wake of the Jasmine Revolution of 2011."
