New York City Mayor Bill de Blasio (D) said Wednesday he is not ready to endorse Hillary ClintonHillary Diane Rodham ClintonDem strategist says Clinton ‘absolutely’ has a role to play in 2020 Left-leaning journalist: Sanders would be 'formidable candidate' against Trump Clinton hits EPA for approval of pesticide dump: ‘We need bees!’ MORE for president, but he's optimistic about her campaign.

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“What I’ve said very clearly is, I think the world of Hillary. I’ve worked with and for her for years,” he said during an interview on MSNBC’s “Morning Joe.” “The bottom line here is that we are at a moment in history where we need to hear a clear vision for investing in the economic reality.”

But de Blasio, who ran Clinton's 2000 Senate campaign, said he believes she is beginning to build a “progressive agenda” and that he is “optimistic” about her campaign.

“I’ve seen some clear signals, some clear ideas come out of her conversations in Iowa, certainly the speech on criminal-justice reform the other day I thought was very powerful, what she said yesterday on immigration. I think she’s beginning to fashion a progressive agenda,” he said. “I think a lot of us, understandably, want to hear the core ideas around the fight against inequality."

His comments come after Clinton staked out liberal positions on both criminal justice and immigration — and gave fresh indications that inequality will be a central topic in her campaign.