U2 frontman Bono brought his star power to Capitol Hill on Tuesday as he called on members of Congress to take swift action to deal with the global refugee crisis and violent extremism.

Before a Senate subcommittee, one of Bono's suggestions was to use comedy to fight extremist groups.

"It's like, you speak violence, you speak their language. But you laugh at them when they are goose-stepping down the street and it takes away their power," he said.

"So I am suggesting that the Senate send in Amy Schumer and Chris Rock and Sacha Baron Cohen, thank you."