Warren's lawyers formally disavow the group in a letter to the FEC.
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"She's very formidable. She'll raise a lot money," the Wisconsin Republican said.
The president returns to Washington after a vacation plagued by criticism.
Republicans pushed President Obama to clarify his plans to combat ISIS.
Mario Trujillo 08/24/14 12:28 PM EDT
Ambassador Peter Westmacott would not confirm or deny reports about potential suspects.
Paul said critics are justified in feeling like race was a factor in the shooting.
Rep. William Lacy Clay said he does not believe Monday's funeral will reignite tensions.
Clay said it was time for a review of programs that supply military equipment to police.
Missouri Gov. Jay Nixon (D) said he was confident "justice will be served" in Ferguson.
USGS says quake was the largest in the area since 1989