Washington (CNN) — The first major book focusing on The first major book focusing on Vice President Mike Pence during his time in the executive branch is set to be released Tuesday.

Penned by authors Michael D'Antonio and Peter Eisner, Shadow President: The Truth about Mike Pence purports that the vice president's rise in politics has been carefully calculated through the years. It draws contrasts between Pence and President Donald Trump, but also comparisons in their use of mass media (Pence once had a radio show in Indiana and jokes he is "Rush Limbaugh on decaf") to build profiles in separate political circles over the years.

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The authors deem Pence a "replacement president," pointing to his recent trips this year to Israel and South Korea where he presided over "landmark events."

Between his political connections to the religious right and powerful fundraising groups, a Trump administration filled with many of his proteges and friends, and his statesman approach to the world stage, D'Antonio and Eisner paint Pence as a "shadow president."

Pence's office did not immediately respond to a CNN request for comment.

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