Washington (CNN) President Donald Trump said he doesn't have much time these days for reading, but that hasn't stopped him from recommending books this year.

Although the White House has not released an official reading list from the President, Trump has not been shy about promoting books on his go-to medium: Twitter.

There's a common theme among the books that have Trump's approval. They either focus on the President in a positive light or have been authored by Trump supporters, friends or anchors on his favorite news channel, Fox News.

Trump's recent predecessors have shared with the American public what they've been reading. Their reading selections were a mix of literary fiction, historic novels, biographies and popular best-sellers. Both Barack Obama and George W. Bush regularly released their reading lists while on vacation. Years after leaving the White House, Bill Clinton released reading lists in honor of National Book Lovers Day or in conjunction with his presidential library preview exhibit.

Here's an unofficial list of the books Trump has endorsed this year:

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