Mercedes Schlapp, the host of the Conservative Political Action Conference, or CPAC, seemed stunned after her audience declined to boo former President Joe Biden.During a conversation with border czar Tom Homan on Thursday, Schlapp asked the Trump official to "compare the Biden years."After mentioning Biden, the host stopped cold and turned to the audience."I'm not hearing a boo when I say Joe Biden people!" she scolded. "Come on! We do audience participation here!"With that, the audience complied by jeering the former president's name."Joe Biden years, when it comes to the border, who came through that border, and now under President Donald Trump, what has happened?" she asked Homan. "Well, over 10.5 million illegal aliens came to the border that we know of," Homan claimed. "Well, thank God we've got President Trump in the Oval Office with the help of the FBI and the intelligence communities. But we got a lot more to find.""Under Joe Biden, 12, 13,000 a day," he added as the audience failed to boo again.