She makes history as the first Black woman to serve as a major political party’s VP pick.

Kamala Harris, the politically shrewd California senator with a law enforcement background that has caused some tensions with the progressive left, was announced Tuesday as Joe Biden’s running mate.

“I’ve decided that Kamala Harris is the best person to help me take this fight to Donald Trump and Mike Pence and then to lead this nation starting in January 2021,” Biden said in an email to supporters.

She makes history as the first Black woman to serve as a major political party’s VP pick.

“I’m honored to join him as our party’s nominee for Vice President, and do what it takes to make him our Commander-in-Chief,” Harris tweeted.

The Biden campaign said Biden and Harris will deliver remarks together on Wednesday in Wilmington, Delaware.

Biden tweeted on Tuesday, “Back when Kamala was Attorney General, she worked closely with Beau. I watched as they took on the big banks, lifted up working people, and protected women and kids from abuse. I was proud then, and I’m proud now to have her as my partner in this campaign.”

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Signaling the campaign’s line of attack against Harris, President Trump responded by tweeting out an attack ad soon after the announcement that called her “phony Kamala Harris.”