Donald Trump Responds to Obama's Jab: 'He Doesn't Know What He's Doing'

Fans lined up on ritzy Fifth Avenue outside Trump Tower in New York City as Donald Trump signed copies of his new book, Crippled America: How To Make Our Country Great Again.

Read: As Ben Carson Surges in the Polls, Trump Says Carson Lacks Experience to be President

"It is called Crippled America because we have a really serious problem in this country and I think it will be a really big book seller," he told INSIDE EDITION's Megan Alexander. 

Trump is hosting Saturday Night Live this weekend for the second time since 2004. Now the Congressional Hispanic Caucus is calling on NBC to "disinvite" Trump, with one congressman calling him an "unapologetic racist" over his stance on immigration.

"He is an ignorant guy to say that, I employ many Hispanics and winning the polls with many Hispanics, Nevada is an example, I am winning he polls," Trump said. "So, anyone that would say that is just a guy that is ignorant." 

Trump was asked at a news conference if he planned to do an impression on SNL of Jeb Bush. He launched yet another zinger at his sagging presidential rival: “My Jeb impression? No, I don't want to do that. I don't like showing a person sleeping at a podium.”

SNL should give Trump a boost just as a new NBC / Wall Street Journal poll has Dr. Ben Carson once again leading Republican voters with 29 percent. Trump is second with 23 percent and Florida Senator Marco Rubio has 11 percent.

Alexander asked him about President Obama's zinger about the latest Republican debate and the candidates’ outrage over the CNBC moderators.

Read: President Obama Says if GOP Candidates Can't Handle CNBC Hosts, How Will They Deal with Russia?

"Have you noticed that everyone of these candidates say, 'Obama's weak. Putin's kicking sand in his face. When I talk to Putin, he's going to straighten out,'" Obama said at a Democratic fundraiser in New York on Monday night. "Then it turns out they can't handle a bunch of CNBC moderators." 

Trump told Alexander: "He can't run the country. He has been a terrible president. He doesn't know what he is doing. He comes up with these little quips and they are cute but the problem is we have a president that doesn't know what he is doing." 

Watch Below: Melania and Eric Trump Support Donald at GOP Debate in Front of 'Hostile' Crowd

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