When Jeb Bush returns next week from Estonia, the tiny, technologically advanced country that shares a border with Russia, he’ll have about 48 hours to shake off the jet lag before a June 15 rally in Miami, where he formally announces his decision to enter the race for the Republican presidential nomination.

That will be the midpoint of a crucial two weeks in which Bush will first try to establish his foreign policy credentials, and then introduce himself to voters. The week before his campaign launch, the former Florida governor travels to Germany, Poland and Estonia; the week after, he will be stumping in Iowa, New Hampshire and South Carolina…

The fact is, Bush has waited so long to make it official that he’s running into a bit of a calendar crunch: The last week of June is expected to bring highly anticipated U.S. Supreme Court rulings on Obamacare and gay marriage, both decisions that have the potential to dominate the political news cycle and force candidates off message as they respond. Then comes the long Independence Day holiday weekend and the start of family vacation season. And then, the first Republican presidential debate in Cleveland on August 6. To have any chance of getting a ticket to be on stage, a candidate has to be officially in the race.