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A librarian in the US state of Idaho says a mystery visitor is hiding books that criticise President Donald Trump or contain liberal viewpoints.

Bette Ammon, a librarian in Coeur d'Alene, said the patron had left a note saying they wanted to keep "propaganda" away from young people.

As well as anti-Trump literature, books on LGBTQ+ issues, gun control and women's suffrage have been hidden or refiled as fiction.

No-one has been caught as yet.

Ms Ammon told the ³ÉÈËÂÛ̳ that some of the books were found hidden in the gaps behind books already on the shelves.

The note she received read: "I am going to continue hiding these books in the most obscure places I can find to keep this propaganda out of the hands of young minds."

The note, written on a comment card left for the library, added: "Your liberal angst gives me great pleasure."

Although library staff reportedly have their suspicions about who is moving the books, no-one has been caught in the act so far.

After a local TV station ran a story about the library, someone contacted Ms Ammon praising the actions of the individual, saying the library only stocks "liberal" books,

Ms Ammon said the library contains books with a wide variety of views, including those praising President Trump.

"There's a saying that a good library has something in it to offend everyone and we're pretty proud that we fit that criteria. We have books serving a diverse community," she added.

If caught, the mystery patron will face what Ms Ammon called the "ultimate punishment" - being banned from the library.