After it became apparent that other methods of protected communication were available, Mnuchin decided not to use military aircraft, she said.
Another trip by Mnuchin and his wife to Kentucky last month is already under review by the Treasury Department's Inspector General.
"Treasury withdrew its request after a secure communications option was identified during the Secretary's extended travel", the spokesperson said Wednesday.
The White House said the six senators who will meet with Trump over dinner include Democrats Manchin, Joe Donnelly and Heidi Heitkamp, along with Senate Finance Committee Chairman Orrin Hatch and fellow panel Republicans Patrick Toomey and John Thune.
Mnuchin's request for use of the jet was denied.More news: UNC Ranks Among Top Public Universities
"This is the most important issue for the American economy", Mnuchin, a former Goldman Sachs partner, said.
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. Though the Treasury secretary later said he'd reimburse taxpayers for the cost of the excursion, the cabinet department's inspector general is reportedly examining what transpired.
The White House says it will soon release legislative priorities for its plans to overhaul the nations tax system and to address hundreds of thousands of young immigrants brought to the United States illegally as children. On the same day as Mnuchin's flight to the eclipse's path of totality, his wife, Linton, stirred controversy after tagging an Instagram post with the social media accounts of the expensive brands she donned in the photo.
On taxes, Mnuchin said the administration was committed to getting legislation passed this year because it thinks tax cuts would boost economic growth.
Do you want to win a free, all expenses paid for, honeymoon trip to Europe? He went to Louisville and Fort Knox on government business regarding tax reform, his office said.
Two people familiar with the matter say Linton was not aware that her husband had requested government travel for their honeymoon before making that comment.