Well, then Obama going on public TV and opining that Clinton shouldn't be prosecuted for her crimes was certainly grounds for impeachment then wasn't it ?
And I say crimes because Clinton is guilty beyond doubt on at least 3 matters of recent note - Perjury (swore on oath before a Federal judge that she had handed over all relevant State Department emails - the FBI found thousands that weren't handed over), Obstruction of Justice (deleted 33,000+ emails some days AFTER receiving a valid subpoena to retain them), and violation of US Security laws - which BTW do NOT require intent, just carelessness.
And just to mention, her foundation keeps such good records that they didn't declare hundreds of millions of foreign donations when they were supposed to, sure, audited, by good friends not doubt.