I find it unbelievable that Trump would have allowed Mr. Mnuchin to be selected without knowing where Mnuchin spent most of his career, especially since they have apparently had business dealings in the past. It would not be out of character for Mr. Trump to select someone who "knows the enemy" but whom he nevertheless has concluded that he can trust.

But I wonder who will be the first to dub the guy "The Munchkin". Oh, wait, I guess it was me.

See the part I have bolded in the text:

Copied from:
https://www.donaldjtrump.com/press-releases/donald-j.-trump-announces-national-finance-chairman

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Donald J. Trump Announces National Finance Chairman

Steven Mnuchin to Serve Critical Role as Trump Campaign Gears up for General Election

(New York, NY) May 5, 2016 – Today Donald J. Trump announced Steven Mnuchin will serve as National Finance Chairman. Mr. Trump is the presumptive Republican Nomination for President of the United States and is taking steps to gear up for a General Election against Democratic Nominee Hillary Clinton. Mr. Trump has self-funded his successful primary battle and will likewise be putting up substantial money toward the general election.

Mr. Trump stated, “Steven is a professional at the highest level with an extensive and very successful financial background. He brings unprecedented experience and expertise to a fundraising operation that will benefit the Republican Party and ultimately defeat Hillary Clinton.”

National Finance Chairman Steven Mnuchin is Chairman and CEO of Dune Capital Management LP, a private investment firm. He is also Chairman of Dune Entertainment Partners LLC. From 2009-2015, he was Founder, Chairman, and CEO of OneWest Bank Group LLC, a bank holding company he owned with a consortium of private investors. The bank merger was the first transaction over 50 billion dollars post the financial crisis. He also previously held a position as a partner at Goldman Sachs and has a B.A. from Yale University. Steven has previously worked with Mr. Trump in a business capacity and brings his expertise in finance to what will be an extremely successful fundraising operation for the Republican Party.

Steven Mnuchin stated, “It’s a great privilege to be working with Mr. Trump to create a world class finance organization to support the campaign in the General Election.”

Mr. Trump is gearing up to defeat Hillary Clinton in the general election. The most recent Rasmussen poll indicated Mr. Trump has an edge over the former Secretary of State.
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