Sen. Cory Booker (D-NJ) said Sunday he has “concerns” about Maine Senate candidate Graham Platner undermining Democrats’ chances to defeat incumbent Sen. Susan Collins (R-ME) in the midterm elections.

While speaking with ABC News’s Jonathan Karl on This Week, Booker answered affirmatively when asked directly if he thinks Platner “may jeopardize Democratic hopes to get that Senate seat in Maine.” Platner’s campaign confirmed reports Saturday that his wife, Amy Gertner, had found “sexually explicit texts with several women” on his phone late last summer.