Downplaying the idea that the criticism of Rep. Devin Nunes is a partisan witch-hunt, Democrats are pointing out that Sens. John McCain and Lindsey Graham have also raised questions about the behavior of the House Intelligence Committee chairman. Mr. Nunes has refused to bow to the demands of Democrats, who are calling on the California Republican to recuse himself from the House panels investigation into possible Russian interference in the 2016 election and allegations of collusion with the Trump campaign.