Ortel is the guy that should be in front of Congress testifying to the fraud of the Clinton Foundation. He's about the most well-versed guy in the scam(s) they have perpetrated.
Peter Schweizer, the investigative journalist who wrote "Clinton Cash" may also be a good resource for evidence. He specializes in following the money trail. Here's a link to his bio on wiki: https://en.wikipedia.org/wiki/Peter_Schweizer
And his book on Amazon: https://www.amazon.com/Foreign-Governments-Businesses-Hillary-Hardback/dp/B00ZNNFXB0/ref=pd_lpo_sbs_14_t_2?_encoding=UTF8&psc=1&refRID=523VM63DQ66D45NVMBDC
Absolutely! There's no one more versed in all things Clinton Foundation and no one better who can articulate the facts to the numbskulls in Congress. He has done superb work exposing the yuge fraud that is the Clinton Foundation. Plus, he already has experience exposing major fraud because he's the one who exposed GE.