"Tonight Show" host Jimmy Fallon cracked a Hillary Clinton joke during his show Monday night — and the audience didn't seem to particularly enjoy it.

Fallon, discussing the recent announcement that Chelsea Clinton is pregnant, joked, "If it's a girl, it'll get some of Chelsea's old hand-me-downs, and if it's a boy, it'll get some of Hillary's."

The joke prompted several boos from the audience.

"It wasn't that hard of a joke," Fallon countered. "What's the big deal?"

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