Hillary Clinton will be President Obama's guest aboard Air Force One en route to their joint campaign appearance Tuesday in Charlotte, N.C., and Donald Trump is not happy about it,
"Why is President Obama allowed to use Air Force One on the campaign trail with Crooked Hillary?" the Republican candidate tweeted Monday. "She is flying with him tomorrow. Who pays?"
Traditionally, the White House and campaigns split the costs of trips that include an election candidate, with allocations to be determined later.
"As in other Administrations, we follow all rules and regulations to ensure that the DNC or other relevant political committee pays what is required for the President to travel to political events," the White House said in a statement.
That explanation will not likely satisfy Trump.
"Taxpayers are paying a fortune for the use of Air Force One on the campaign trail by President Obama and Crooked Hillary," Trump said in a separate tweet Tuesday. "A total disgrace!"
The Air Force, responding to a public records request, reported two years ago that it costs $206,337 an hour to operate Air Force One.
The Obama-Clinton trip will take about an hour.
Clinton will not be on Air Force One for Obama's return trip to Washington; D.C.; she'll be headed to a Wednesday campaign event in Atlantic City, N.J.
This will be Obama's first appearance on the campaign trail with his former secretary of state; he and Clinton had planned to stump in Wisconsin last month, but that appearance was canceled in the wake of the Orlando terrorist attack.
Charlotte is the city where the Democratic Party re-nominated Obama to the presidency four years ago.
Clinton and Obama won't be the only politicians in North Carolina on Tuesday — Trump is speaking at night in Raleigh, accompanied by Sen. Bob Corker, R-Tenn., another lawmaker considered a potential GOP vice presidential candidate.