NEW: Andy McCabe - under investigation - seeks immunity as part of deal to testify before Grassley's panel next week. He may have to plead Fifth if he doesn't get it. Grassley also wants Comey and Lynch to appear before panel on IG report. @LauraAJarrett https://t.co/ymeVO78HgN

— Manu Raju (@mkraju) June 5, 2018