Once again, an erupting Icelandic volcano is complicating President Obama’s travel.

This time the volcano is Grimsvotn, and it is forcing President Obama to leave Ireland early.

White House deputy press secretary Josh Earnest announced Monday that the president would need to leave Ireland a day early because of the dense ash plume. The UK’s Civil Aviation Authority said the ash might reach Scottish air space as soon as tomorrow.

"Due to a recent change in the trajectory in the plume of volcanic ash, Air Force One will depart Ireland for London tonight,” Earnest said. “The schedule for tomorrow will proceed as planned."

Last November, President Obama had to cut short his visit to a different nation where he was having something of a homecoming: Indonesia, where he spent four years as a child.

In April 2010, President Obama had to cancel a visit to Poland for the funeral of Polish President Lech Kaczynski, killed in a plane crash with his wife and dozens of other Polish leaders.

Those latter two incidents were the fault of Eyjafjallajokull. That pesky volcano also caused General Stanley McChrystal and his aides to spend more time with a Rolling Stone reporter than they had originally planned, with a whole other set of repercussions.

-Jake Tapper