Shortly after presumptive Democrat nominee Joe Biden chose Kamala Harris as his vice-presidential nominee, former President Barack Obama expressed support for the move in a tweet that included a detailed statement.

“Joe Biden nailed this decision. By choosing Senator Kamala Harris as America’s next vice president, he’s underscored his own judgment and character,” Obama tweeted.

“This is a good day for our country. Now let’s go win this thing,” he added.

Read the full statement:

Statement from President Obama on the Selection of Senator Kamala Harris as Vice President Joe Biden’s Running Mate 

Choosing a vice president is the first important decision a president makes. When you’re in the Oval Office, when the toughest issues, and the choice you make will affect the lives and livelihoods of the entire country – you need someone with you who’s got the judgment and the character to make the right call. Someone whose focus goes beyond self-interest to consider the lives and prospects of others. 

Joe Biden nailed this decision. By choosing Senator Kamala Harris as America’s next vice president, he’s underscored his own judgment and character. Reality shows us that these attributes are not optional in a president. They’re requirements of the job. And now Joe has an ideal partner to help him tackle the very real challenges America faces right now and in the years ahead. 

I’ve known Senator Harris for a long time. She is more than prepared for the job. She spent her career defending our Constitution and fighting for folks who need a fair shake. Her own life story is one that I and so many others can see ourselves in: a story that says that no matter where you come from, what you look like, how you worship, or who you love, there’s a place for you here. It’s a fundamentally American perspective, one that’s led us out of the hardest times before. And it’s a perspective we can all rally behind right now.

Follow Joshua Klein on Twitter @JoshuaKlein.