CHICAGO (CBS) — An employee at The Aviary cocktail bar was arrested Tuesday night, after spitting on Eric Trump, the son of President Donald Trump.

A source close to Eric Trump called it “a disgusting act by somebody who clearly has emotional problems.”

CBS 2 has learned the worker has been placed on leave and was detained by authorities for about two hours. Eric Trump declined to pursue charges, sources said.

In a statement, Aviary called the incident unfortunate and is investigating.

Chicago police would only say they assisted the Secret Service with “a law enforcement matter” Tuesday night at the popular West Loop cocktail bar, and the Secret Service declined to comment.

Eric Trump told Breitbart News it a “disgusting act” that demonstrates Democrats lack civility.

“It just emphasizes a sickness and desperation and the fact that we’re winning,” Trump told Breitbart.

However, it appeared Trump was enjoying his time in Chicago overall. He tweeted pictures of Trump Tower, writing “It is one of the most beautiful buildings in the world!”

In the statement released by Aviary, the restaurant said “no customer should ever be spit upon. We have not yet spoken with the employee but our HR team has, in the meantime, placed her on leave.”

“We hope this incident can, at least, serve to illuminate the current absurdity of the discourse in our politics. As fellow Americans and citizens, we should all aim higher.”