Sanders: 'What do the Russians have on Mr. Trump?'
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Sen. Bernie SandersBernie SandersBriahna Joy Gray: Biden campaign promises will struggle if Republicans win back Congress Biden backs COVID-19 vaccine patent waivers McConnell sidesteps Cheney-Trump drama MORE (I-Vt.) on Thursday piled onto ongoing questions about President Trump and his associates' ties to Russia.

Days after the FBI confirmed it is probing any possible cooperation between Trump's team and Moscow, Sanders implied Russian President Vladimir Putin might "have" something on the president.

Questions about Trump and his current and former aides' potential ties to Russia have roiled his administration in its first two months. The president's first national security adviser, Michael Flynn, resigned after it was revealed that he discussed sanctions with Russian Ambassador Sergey Kislyak before Trump took office.

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And Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsEx-Sen. Doug Jones joins law and lobbying firm Arent Fox Former Barr spokesperson at DOJ hired to be Fox News Washington editor Biden should call for Article I immigration courts MORE has also come under scrutiny for failing to disclose the fact that he twice met with Kislyak while he was acting as a surrogate for Trump's election campaign last year. He recused himself from any federal investigations into Russian election meddling and the Trump campaign last month.

Sanders's questions followed House Intelligence Committee Chairman Devin Nunes's (R-Calif.) announcement Wednesday that he had seen evidence that the intelligence community incidentally gathered information on Trump transition team members during routine surveillance of foreign targets.

Nunes said, however, that the intelligence collections had "nothing to do with Russia and nothing to do with the Russian investigation."

The intelligence community has concluded that Putin was behind Russian efforts to interfere in the U.S. election in order to help Trump's campaign.

The FBI is currently investigating the Kremlin's election meddling, as well as potential links to Trump's team, Director James Comey confirmed at a House hearing on Monday.

Trump has repeatedly denied any relationship between himself or his campaign and the Russians, and has called media reports on the matter "fake news."

Trump has spoken fondly of Putin on multiple occasions, saying at one point that he is a stronger leader than former President Barack ObamaBarack Hussein ObamaCensus results show White House doubling down on failure Gender politics hound GOP in Cheney drama Never underestimate Joe Biden MORE and expressing a willingness to cooperate with Russia on certain issues, such as fighting the Islamic State in Iraq and Syria.