Politico is reporting that NPR executives recently asked political correspondent Mara Liasson to reconsider her relationship with Fox News. NPR brass is concerned that the cable news channel’s programming has grown more partisan and regular appearances on Fox by Liasson and NPR news analyst Juan Williams add to the perception that NPR tilts to the left, according to Politico. Liasson declined to sever her ties with Fox. Williams, whose NPR contract gives him wide latitude for outside work, no longer identifies himself as an NPR analyst when appearing on the cable channel. NPR denies that its request for Liasson has anything to do with the White House’s recent campaign to discredit Fox as a shill for the Republican party. An unnamed source tells Politico that the White House criticism of Fox came up during talks with Liasson.