Ever since news broke that Health and Human Services Secretary Tom Price used chartered flights on official business, his future in the administration has been in question.

But it's now official: Price resigned on Friday afternoon.

So, how did we get here? We break it down for you.

What exactly did Price do?

Since May, Price took at least 26 chartered flights for official business around the country. The flights included travels to Tennessee, Michigan, West Virginia, Maine, New Hampshire, California, Colorado, Utah, Texas, Illinois, Georgia and Pennsylvania. According to Politico, which first broke the news, the combined cost of the chartered flights totaled at least $400,000.

Price also racked up $500,000 in military flight costs for international travel.

If it cost so much, why did he do it?

According to HHS, Price took private planes when commercial flights weren't available. But it's worth noting that his predecessors in the Obama administration, Kathleen Sebelius and Sylvia Mathews Burwell, only took commercial flights while they were in office.

Has he apologized?

Yes.

"I regret the concerns this has raised regarding the use of taxpayer dollars," he said in a statement on Thursday. "All of my political career, I've fought for the taxpayers. It is clear to me that in this case, I was not sensitive enough to my concern for the taxpayer. I know as well as anyone that the American people want to know that their hard-earned dollars are being spent wisely by government officials."

He also vowed to personally pay for his portion of the flights.

What was the White House's take on all of this?

Trump said of Price's scandal, "I'm not happy, I can tell you."

Additionally, Trump spokeswoman Sarah Huckabee Sanders said the White House has asked HHS to stop approving chartered flights.

“That’s something that we’re certainly looking into from this point forward and have asked a halt be put, particularly at HHS, on any private charter flights moving forward — until those reviews are completed,” she said.

Are there other officials whose travel is under scrutiny?

Yes. Treasury Secretary Steven Mnuchin reportedly asked to use a government plane for his honeymoon, while EPA Administrator Scott Pruitt has traveled back to Oklahoma on the taxpayers' dime.