Leaked emails reveal Clinton team was most worried about facing Marco Rubio

Donald Trump's caustic and chaotic presidential campaign has many conservatives pining for an alternate universe where Trump failed to win the GOP nomination.

That raises the question: In a world without Trump, who would've been the best Republican option to beat Clinton? We'll never know for sure, but new leaked emails show Clinton's team was pretty worried about Marco Rubio.

SEE MORE: What's So Damning About The New Hillary Clinton Emails From WikiLeaks?

The latest batch of emails dumped from WikiLeaks shows Clinton's campaign staff already plotting about how to take down Rubio if the two were to square off for the presidency.

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Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton acknowledge each other at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton stand together at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton appear together during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Mike Segar
Republican U.S. presidential nominee Donald Trump listens as Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks at the start of the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens and takes notes during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump turns his back as Democratic U.S. presidential nominee Hillary Clinton talks about his comments about women during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Moderators Anderson Cooper and Martha Raddatz speak before the start of the second U.S. presidential debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Melania Trump, Ivanka Trump, Eric Trump and Donald Trump Jr. stand before the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016.
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton acknowledge each other at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks during the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Democratic U.S. presidential nominee Hillary Clinton speaks during the second U.S. presidential town hall debate between Clinton and Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
The family of U.S. Republican presidential nominee Donald Trump, (L-R) Melania, Ivanka, Eric and Donald Jr. wait for the presidential town hall debate with U.S. Democratic presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Marc Mezvinsky, Chelsea Clinton and Former U.S. President Bill Clinton sit at the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Republican U.S. presidential nominee Donald Trump listens as Democratic nominee Hillary Clinton answers a question from the audience during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
Democratic U.S. presidential nominee Hillary Clinton speak during her debate against Republican U.S. presidential nominee Donald Trump (L) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump speaks during his presidential town hall debate against Democratic U.S. presidential nominee Hillary Clinton (not shown) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Aaron P. Bernstein
Republican U.S. presidential nominee Donald Trump speaks during the presidential town hall debate with Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton TPX IMAGES OF THE DAY
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton speak during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
U.S. Democratic presidential nominee Hillary Clinton and her husband, former U.S. President Bill Clinton, board her campaign plane after the presidential town hall debate against U.S. Republican presidential nominee Donald Trump in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Former U.S. President Bill Clinton watches as Republican U.S. presidential nominee Donald Trump (L) and his wife, Democratic U.S. presidential nominee Hillary Clinton, participate in their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump speaks during the presidential town hall debate with Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton pause at the conclusion of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Saul Loeb/Pool
Democratic U.S. presidential nominee Hillary Clinton speaks during the presidential town hall debate with Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump listens as Democratic U.S. presidential nominee Hillary Clinton speaks during their presidential town hall debate with at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Shannon Stapleton
(L-R) Kathleen Willey, Juanita Broaddrick and Kathy Shelton sit together in the audience before Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton begin their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Mike Segar
Republican U.S. presidential nominee Donald Trump speaks as Democratic U.S. presidential nominee Hillary Clinton listens during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump's daughters-in-laws Lara Trump, Vanessa Trump and daughter Tiffany Trump (L-R) are seated at the start of the second U.S. presidential town hall debate between Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Chelsea Clinton and Former U.S. President Bill Clinton arrive at the presidential town hall debate between Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Rick Wilking
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton face the audience during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Lucy Nicholson
Republican U.S. presidential nominee Donald Trump looks at Democratic U.S. presidential nominee Hillary Clinton during their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
Republican U.S. presidential nominee Donald Trump is seen during his presidential town hall debate against Democratic U.S. presidential nominee Hillary Clinton (not shown) at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Journalists Anderson Cooper and Martha Raddatz prepare to moderate the presidential town hall debate between U.S. Democratic presidential nominee Hillary Clinton and U.S. Republican presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S. October 9, 2016. REUTERS/Brian Snyder
Democratic U.S. presidential nominee Hillary Clinton makes her opening remarks at the start of the second U.S. presidential town hall debate between Clinton and Republican U.S. presidential nominee Donald Trump at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton take the stage at the start of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Bourg
Republican U.S. presidential nominee Donald Trump and Democratic U.S. presidential nominee Hillary Clinton shake hands at the end of their presidential town hall debate at Washington University in St. Louis, Missouri, U.S., October 9, 2016. REUTERS/Jim Young TPX IMAGES OF THE DAY
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WikiLeaks and the information it provides have been a divisive topic during the presidential race. Critics say the website's founder, Julian Assange, is only leaking information that's harmful to Democrats because he's working on behalf of Russia to try and influence U.S. politics.

The documents reveal that the Clinton campaign saw a lot of similarities between Rubio and the last politician who beat Clinton: President Obama.

Clinton's deputy communications director said Rubio's campaign announcement speech "sounded much more reasonable, populist and accessible than much of the rest of the GOP field."

Rubio and Obama each have distinct advantages over Clinton. Both are able to connect with minority voters in a way she never could. They also have youth on their side. In his first speech, Rubio appealed to younger voters, calling them "our generation."

But Clinton's team was already preparing critiques of its own. They were planning to fault Rubio for his habit of missing Senate votes and his hardline stance on Cuba. Those strategies aren't useful now, but there's a chance Clinton's team might need to revisit them in four years.

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