A confident Donald Trump declared Sunday he will win the African-American and Hispanic vote and that Obama has done "nothing" for "African-American citizens of this country."

On ABC's "This Week," Jon Karl asked Donald Trump about a tweet from last year, where the Republican candidate wrote: "Sadly because Barack Obama has done such a poor job as president, you won't see another black president for generations."

"What did you mean by that?" asked Karl.

Obama "has been a very poor president," said Trump. "I think he has done a very poor job as president. We have 18 trillion dollars in debt and going up rapidly, rapidly ..."

"But what did you mean?" cut in Karl.

"Wait a minute, wait a minute," said Trump, not allowing Karl to interrupt him. "We don't have victories anymore. China is killing us in trade. Mexico is killing us at the border and also killing us on trade. Mexico is doing unbelievably against us on trade."

"You look at what's going on with Japan, you look at what's going on with Vietnam, you look at Saudi Arabia makes a billion dollars a day and we defend them, we get nothing," said Trump.

"I understand your critique," said Karl. "But why do you say that means we won't see another black president for generations?"

"Because I think that he has set a very poor standard, I think that he has set a very low bar," said Trump. "I think that it's a shame for the African-American people. And by the way, he has done nothing for African-Americans. You look at what's gone on with their income levels, you look at what's gone on with their youth, I thought that he would be a great cheerleader for this country. I thought he would do a fabulous job for the African-American citizens of this country; he has done nothing! They are worse now than just about ever."

"But, but ..." began Karl.

"Excuse me!" interjected Trump. "They have problems now in terms of unemployment numbers, look at [their] unemployment numbers!

"Here you have a black president that has done very poorly for the African-Americans of this country," said Trump. "And I think that I will win the African-American vote, and I think I will win the Hispanic vote. And if you see the recent polls that came out, you will see that, Jon."

Trump told Karl he was leading the Hispanic vote in the polls. A July 20-21 Public Policy Polling survey showed Trump received 34 percent of the Hispanic vote, ahead of former Florida governor Jeb Bush, R-Fla.

However, a CNN/ORC poll found that Trump also has sky-high unfavorability ratings, with 59% of registered voters having a negative opinion of the reality show star whose catchphrase was "You're fired!"