Yes, Trump could be indicted. The 'Nixon tapes' case proves it.
Trump's going down soon
"In fact, in the Nixon tapes case, the Supreme Court rejected essentially the same point that Trump supporters are making. There Nixon argued that, as chief executive overseeing enforcement of the federal laws, he was not subject to demands by the special prosecutor that the president produce evidence sought by the prosecutor.
The court unanimously upheld the fundamental constitutional principle that no person is above the law, and even the president is subject to the ordinary obligations and prohibitions of federal law applicable to everyone else. The name of the case says it all: United States v. Richard M. Nixon, President of the United States.
Another major argument for presidential immunity is that the burden of defending against a criminal charge would distract an incumbent president from performing his important public duties. That argument, too, did not convince the Supreme Court when President Clinton claimed immunity from having to defend against the civil sexual harassment lawsuit brought against him by Paula Jones.
The court emphasized that a president acquires no special immunity from being held accountable for personal misconduct and explained that trial courts are capable of managing legal proceedings in a way that minimizes the impact of a trial on the performance of presidential duties."