Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) said on Sunday that he does not always see eye to eye with Democratic presidential front-runner Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE.

“She and I disagree on many issues,” Sanders, himself a 2016 White House hopeful, said of Clinton on ABC’s “This Week.”

“I have a lot of respect for Hillary Clinton,” he told host Jonathan Karl. “She is somebody I’ve known for 25 years.”

“I’m not going to be engaging in personal attacks against her,” Sanders added.

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“The American people want a serious debate about serious issues, not personal attacks.”

Sanders said on Sunday that he is surprised by Clinton’s reluctance to state her position on whether the U.S. should build the Keystone XL oil pipeline.

“I have a hard time understanding that response,” he said.

“I have helped lead the effort against the Keystone pipeline,” Sanders said.

“And I’m very proud, by the way, that just yesterday we received the endorsement from Friends of the Earth, one of the largest environmental organizations in America,” he added. “And this is one of the reasons that they gave me their endorsement.”

Sanders additionally charged that he has national appeal beyond progressive voters.

He said on Sunday his campaign plans on widening its message and reaching more Americans heading into 2016.

“We’re going to continue to make that kind of progress,” Sanders said.

“We are going to be reaching out effectively, I believe, for the African-American community, because I have not only one of the strongest civil rights voting records in the United States Congress, we have an agenda that calls for creating jobs, for raising the minimum wage to $15 an hour, to making public colleges and universities’ tuition free,” he said.

“That is going to appeal in a significant way, I believe, to the African-American community, to the Hispanic community,” Sanders added.

“So let’s talk three months from now. I think you will see that our campaign makes significant inroads all across the country.”