With the 2020 presidential race underway and a possible impeachment of President Trump on the horizon, 2019 has been an action-packed year so far in American politics. Here to discuss five new political books that break down how we got to where we are is CNBC editor-at-large John Harwood, whose razor-sharp analysis has put him at the forefront of our television screens and the nation's political discourse.

In the 1998 Clinton impeachment proceedings, only one legal scholar was called as a joint witness: Michael J. Gerhardt, now a Professor of Law at the University of North Carolina at Chapel Hill and a prolific expert on subjects of constitutional history, the legislative process, and impeachment. With the impeachment inquiry into President Donald Trump well underway, he recommends five books crucial to understanding the subject.

Is Senate Majority Leader Mitch McConnell just as important as President Trump? Julian E. Zelizer, Princeton historian and CNN Political Analyst, thinks so—and he argues that to understand American politics, you have to understand Congress. He recommends the best books for getting to grips with the nuts and bolts of the Senate and House of Representatives.

‘We’re on a path that is going to lead to tremendous destruction and yet most of us are going about our lives as if nothing particularly special is happening.’ The science of climate change is incontrovertible but deniers persist and political and economic solutions continue to be – systematically – frustrated. Time is running out, says Naomi Oreskes

Inequality is coming not just from the economy; it is coming from politics and policy, says Jamila Michener, assistant professor of government at Cornell University. Here she chooses five books that showcase some of the best, most thought-provoking writing on the politics and consequences of policy.

As America votes in a new president, veteran political journalist and author, David Maraniss, recommends the best books to read to get a better understanding of Hillary Rodham Clinton.

With its passion for neoliberal ideology, the US uses its economic weight clumsily in terms of foreign policy, says former state department official and senior fellow at the Council on Foreign Relations, Jennifer M. Harris. Here she picks the best books for understanding the vital area of geoeconomics.

The author and journalist describes how racism, violence, and corruption became entrenched in police departments across America. He picks five books describing a stark reality, and suggests a blueprint for change

Americans remember Reagan fondly, but what did the Gipper really stand for? The historian chooses the best books on Ronald Reagan and his time.

Ruth Bader Ginsburg (1933—2020) spent her life working tirelessly for a more just society, says Amanda Tyler, Shannon C. Turner Professor of Law at Berkeley and former law clerk to the Supreme Court Justice. She recommends the best books to read about RBG: her life, her work, and even her personal training regime.