Amazon CEO Jeff Bezos posted a picture of the visit on Twitter, where he wrote that it was “a pleasure” to host the official.

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U.S. Defense Secretary James Mattis visited Amazon.com’s South Lake Union headquarters Thursday, part of a whirlwind tour of West Coast tech hubs.

Amazon CEO Jeff Bezos posted a picture of the visit on Twitter, where he wrote that it was “a pleasure” to host the official.

It’s unclear what Bezos and Mattis talked about: Amazon declined to give any details. A Defense spokesman traveling with Mattis didn’t immediately respond to a request for information either.

Amazon is not the only tech giant Mattis is visiting: According to the Silicon Valley Business Journal, he’s scheduled to visit Google’s Mountain View headquarters this week.

On Wednesday, Mattis visited Naval Base Kitsap, in Bangor, Wash.