Now let me speak directly to my Republican friends who care about America’s place in the world. It’s no longer so important how your party arrived at this day. But it’s here. Donald Trump is your nominee. A man who wants to build walls around America like we’re East Berlin during the Cold War. A man who wants to ban Muslims from entering the United States, while we’re working so hard with our allies to convince the world’s Muslims to reject extremism. A man who wants to start a trade war with China. A man who thinks more countries ought to have nuclear weapons. A man so consumed by petty vindictiveness that he can’t keep himself from attacking your fellow Republicans over even the tiniest slight, real or perceived, no matter the political cost.

I know you love your country more than you love your party. This isn’t a matter of policy quibbles, or questions about the implications of one foreign policy doctrine or another. This is an emergency. In foreign policy, Donald Trump is nothing less than the most dangerous person either party has ever nominated for president. And I do mean ever. His combination of ignorance, impulsiveness, and insecurity make handing America’s foreign policy and national security a worse idea than letting your dog drive your car on the highway.

I can’t promise you that you’ll always agree with my decisions. And I’m sure that if I’m elected this year, in 2020 your party will nominate someone you’ll be proud to back in order to make me a one-term president. I look forward to that debate. But for now, I implore you: make a decision that you, and the country, can live with.