it's not clear if police are still looking for any other suspects. but we expect to learn more details this afternoon when authorities in moscow, idaho, hold a news conference. gop leader kevin mccarthy is expected to hold a conference call with members of his caucus today. it's part of an attempt to secure more votes in his bid to be house speaker. now, cnn has learned mccarthy is offering a key concession to his critics, just days before the vote. cnn's melanie zanona live on capitol hill. hi, melanie. what is this deal mccarthy is working on, and will it get him to the votes that he needs? >> reporter: yeah, so the big debate that's been going on behind the scenes is over this tool known as the motion to vacate the speaker's chair, a vote on deposing the sitting speaker. currently it requires a majority of the entire house gop to trigger that vote. mccarthy's critics want any single lawmaker to be able to trigger that vote. up until this point, though, mccarthy has been resistant to budge on the issue.