"we have an attributed Senator's reported comments that it started under Biden"
Nope; unsupported comment.
"tell me any evidence that Trump initiated it"
Easy. Emphasis added, just for you.
"Trump Administration Initiated Boeing 747 Deal With Qatar"
"President Donald Trump's administration was first to reach out to Qatar about acquiring a $400-million Boeing 747 for Air Force One, according to a report from CNN.
The report, which cites four individuals familiar with the matter, adds context to the administration's repeated assertions that the jet was simply a "gift" from the Gulf state.
A White House official confirmed the accuracy of CNN's report when contacted by Newsweek.
The Pentagon referred Newsweek to the White House."