It may or may not have been the first time an attempted illegal border crossing was live-tweeted.

It very likely was the first time such an event was live-tweeted by a sitting U.S. senator.

During a visit to the border town of Nogales, Ariz., Sen. John McCain, along with three other senators, watched a woman successfully jump the border fence, getting a firsthand look at one of the main issues surrounding immigration reform: how to secure the border.

McCain sent out a Twitter picture Wednesday following the event, saying: