(CNN)Former Rhode Island Gov. Lincoln Chafee said Thursday on CNN that he's running for the Democratic nomination for president, just a week after announcing he formed an exploratory committee, his most definitive statement he's made toward formalizing a 2016 campaign.
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Lincoln Chafee: 'I'm running' and here's why
"Yes, that's why I'm running. Because I feel strong about where we're going as a country," Chafee told CNN's "New Day" on Thursday, when asked why he's been so critical of Democratic front-runner Hillary Clinton. Chafee was asked by CNN's John Berman in the context of having not formally declared his presidential campaign.
Chafee spokeswoman Debbie Rich said Chafee did not declare himself as a candidate for president Thursday, despite saying "that's why I'm running."
"We are still in the exploratory committee phase," she told CNN in a phone interview, adding, "We will file the proper papers to be an official candidate, but that has not happened yet."
Chafee, a former Republican and former senator, announced he was forming an exploratory committee last week. Chafee's been differentiating himself from fellow Democratic primary contenders by taking sharp jabs at Clinton, willing to be more critical than would-be challengers former Maryland Gov. Martin O'Malley or former Virginia Sen. Jim Webb over her vote in Congress to authorize the war in Iraq.
"That was a moment where the premise for going to Iraq was so false that there were weapons of mass destruction; she didn't do her homework. We live with the ramifications," Chafee told CNN's "State of the Union" over the weekend. "You may say that's 12 years ago — that's a big motivator for me running. If you show a lack of judgment, lack of doing homework then, what can we expect in the future?"
Chafee has been blurring the line between considering a run and actually running since last week. In his CNN interview with Dana Bash over the weekend, he all but declared his candidacy.
"I want to be on the stage in November, December and January debating these issues," he said.
A long shot who's been out of office since his gubernatorial term ended at the beginning of 2015, Chafee hadn't been included in the overwhelming majority of public polling of the Democratic primary.
Chafee acknowledged his chances in Thursday's interview.
"There's no doubt I'm the underdog," he said.