The letters are signed by Rep. Joe Pitts (R-Pa.), chairman of the House Energy and Commerce Health subcommittee, and by Sens. Chuck GrassleyChuck GrassleyComey to testify before Senate Judiciary Committee GOP to kill language exempting staff from new ObamaCare repeal bill House cyber chairman wants to bolster workforce MORE (R-Iowa), Michael Enzi (R-Wyo.) and Orrin HatchOrrin HatchGinsburg pines for more collegial court confirmations Senate's No. 2 Republican: Border tax 'probably dead' Overnight Finance: Inside Trump's tax plan | White House mulls order pulling out of NAFTA | New fight over Dodd-Frank begins MORE (R-Utah.).