Can the president be indicted or subpoenaed?

Can the president be indicted or subpoenaed?  Washington Post Pressure rising on GOP after Trump–DOJ fight's latest turn  The Hill Justice Department To Expand Internal Inquiry After Top-Level Meeting With Trump  NPR FBI Used Informant to Investigate Russia Ties to Campaign, Not to Spy, as Trump Claims  New York Times Concealed FISA Docs May Hold Key to Trump Surveillance  Sara A. Carter (blog)Full coverage