Story highlights Donald and Melania Trump were married January 22, 2005

It's unclear how they celebrated their 13th anniversary

Washington (CNN) Donald and Melania Trump marked 13 years of marriage on Monday, but signs of a celebration were conspicuously absent.

In a whirlwind news day focused primarily on the government shutdown, the first couple exchanged no public notes of endearment. The day came and went with no tweets, no Instagrams, no mention of a private dinner on the President's schedule.

And in the evening, it was announced that the first lady would no longer be joining the President on his trip to the World Economic Forum in Davos, Switzerland, according to her communications director Stephanie Grisham, who cited "scheduling and logistical issues" and declined to provide further details.

The White House and the East Wing did not respond to CNN's request for details on how the couple spent their anniversary.

A lavish wedding

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