The treasury department's inspector general is investigating Mnuchin's request for a USA air force plane - with a reported operating cost of around $25,000 per hour - to transport him and his wife, Louise Linton, on their honeymoon to Scotland, France and Italy this summer, according to ABC News.
The Treasury Department has previously defended Mnuchin's trip as "official government travel" and denied that viewing the eclipse was the primary goal of the trip.
In a statement to BuzzFeed News, the Treasury Department confirmed that the request was made, and considered, because of Mnuchin's role as a member of the White House National Security Council.
"Treasury withdrew its request after a secure communications option was identified during the Secretary's extended travel", the spokesperson said Wednesday.
Needless to say, Mnuchin's receiving some criticism, including from Senator Ron Wyden (D-OR) of the Senate Finance Committee.
Politico reported that requests to use military jets for personal travel are unusual, but not unprecedented.
Mnuchin, who married the Scottish-born actress Louise Linton in a ceremony officiated by Vice President Michael Pence in June, submitted a written request for his honeymoon in August, sources told ABC. The claim was eventually pulled when they realized using the plane, which reportedly can cost $25,000 an hour to operate, was completely unnecessary.
Miss Linton caused controversy when she posted a photograph on social media of herself getting off the plane in Kentucky and listing the designer labels she was wearing including Hermes and Valentino.
In an interview with CNBC, Mnuchin also said the administration would consider making tax cuts effective back to the start of this year if a measure didn't pass until 2018. "Do you think the U.S. Government paid for our honeymoon or personal travel? Lol. Adorable!" Linton wrote in response to a commenter who called her "deplorable" for her gaudy display of wealth while disembarking a government plane. He said he was "incredibly hopeful" a tax plan could be enacted this year, adding it could be retroactive to January.
For starters, they are going to assume the tax legislation will mean more economic growth and greater future tax revenue.
This isn't the first time questions have been asked about Mnuchin and government resources.