An aide to Hillary ClintonHillary Diane Rodham ClintonO'Rourke's rise raises hopes for Texas Dems down ballot Gabbard considering 2020 run: report Claiming 'spousal privilege' to stonewall Congress MORE recently met with the founder of the Progressive Change Campaign Committee (PCCC), which strongly supports Sen. Elizabeth WarrenElizabeth Ann WarrenDNA is irrelevant — Elizabeth Warren is simply not Cherokee The Hill's 12:30 Report — Trump seizes on immigrant 'caravan' for midterms | WHCA criticizes Trump for praising lawmaker who assaulted reporter | Trump takes harder line on Saudis Clinton aide: Chances 'highly unlikely' but 'not zero' Hillary will run for president again MORE (D-Mass.), the group confirms.

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The meeting with PCCC founder Adam Green, first reported by Politico, could be a sign that the Clinton camp is reaching out to liberal groups that are more enthusiastic about Warren than about Clinton ahead of the 2016 presidential race. It is unclear which side requested the meeting, who the Clinton aide was or what was discussed.

The PCCC is an enthusiastic backer of Warren, who some liberals hope will challenge the former secretary of State from the left in the presidential primary. 

"It is time for Democrats to remold the party around Elizabeth Warren's big economic populist ideas -- like breaking up 'too big to fail' banks, expanding Social Security, and making college way more affordable," the group said in a statement earlier this week.

However, the PCCC has so far not joined the formal "Run, Warren, Run" effort organized by two other liberal groups, MoveOn.org and Democracy for America.

Laura Friedenbach, a spokeswoman for the PCCC, said the group will have more to say about the presidential race in the "near future."

Neil Sroka, a spokesman for Democracy for America, said the group hadn't been approached by the Clinton camp. A spokesman for MoveOn.org did not immediately respond to a request for comment.  

The "Run, Warren, Run" effort had its kickoff event in Des Moines, Iowa, on Wednesday, and has raised a $1.25 million investment between the two groups. The online petition has received over 100,000 signatures.

Warren has insisted that she is not running for president, but supporters point out that she always phrases the denial in the present tense, not the future.