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Jonathan Turley warned that prosecutors in the Russia investigation will use whatever evidence they have to charge their targets.

He explained that Special Counsel Robert Mueller would not want to spend so much money on his team of lawyers and come up with nothing in the investigation of the Trump campaign's connections to Russia.

Former Trump campaign manager Paul Manafort turned himself in to the Washington, D.C. FBI office this morning on charges of money laundering in Russia-related business deals.

Manafort and his shady personal business dealings connected with Russia put him "at the top of most people's list" as a target in the investigation, Turley said.

"Prosecutors will often indict someone to put pressure on them," the George Washington University constitutional law professor told "Fox & Friends" on Monday. "They are clearly trying to put pressure on Manafort to see if he has something to offer about someone above him, and we know who that likely would be in the view of the prosecutors."

Manafort and his business associate and fellow campaign official Rick Gates are the first to be charged in the Russia collusion probe.

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