It's only been five years or so since reporters started asking, so Marco Rubio will need
just a few more weeks to be ready to release details on the personal expenses he charged to a Republican Party of Florida credit card between 2005 and 2008.
“We’re going through them to make sure we have everything in place, that we don’t have to do it twice. These are old records,” Rubio said. “All of the expenses are already detailed in the Republican Party’s filings, in department of State, in the department of Elections. In the next few weeks we’ll make that public.”
Five years, dude. You've had five years and, as you note, the expenses should already be detailed in existing filings.
At issue is how much in the way of personal expenses Rubio charged to the Republican Party's card. According to Rubio, he paid his personal expenses directly to American Express each month, and it's very very important that this was technically a charge card, not a credit card:
“People need to understand what they’re talking about here. It wasn’t a credit card, it was an American [Express] charge card, secured under my personal credit in conjunction with the Party,” Rubio said. [...]
“Every month a bill came to my house and I would review it. If there was something personal I paid for it. If it was political the party paid for it. I didn’t pay for it after the fact, I paid during the time,” Rubio insisted.
You can charge personal expenses to a business charge card as easily as to a business credit card, though. And a key question is whether Rubio did identify and pay off every personal expense or whether the Republican Party ended up picking up some of his personal stuff—at the end of the month or whenever. This is, after all, someone who regularly grabbed the wrong credit card when making personal purchases and had to
repay $2,400 after double-billing plane flights to both the Republican Party and the state of Florida. His bookkeeping is not so impeccable that "trust me" is an adequate answer.