It's customary for new U.S. citizens to receive a letter signed by the president welcoming them as Americans, but typically that letter comes from the current U.S. president.

Not so for the husband of Aisha Sultan, a syndicated columnist at the St. Louis Post-Dispatch. Her husband, who is referred to in the letter only as "My fellow American," received a signed letter Friday not from President Trump, but from his predecessor, Barack Obama.

"My British-born husband takes his oath of citizenship today. In the packet for new Americans, the welcome letter from POTUS is from Obama," she tweeted.

My British-born husband takes his oath of citizenship today. In the packet for new Americans, the welcome letter from POTUS is from Obama. 😂 pic.twitter.com/O56cMj0hhx — Aisha Sultan (@AishaS) July 14, 2017

The letter congratulates her husband for becoming an American and encourages him to become engaged and to uphold the principles of a democracy.

According to U.S. Citizenship and Immigration Services, roughly 200 of these letters have been sent out due to an administration error. A total of 300,000 applications for citizenship have been approved since Trump's inauguration.