Washington (CNN) President Donald Trump requested the FBI investigate how the Obama administration was involved in Russian meddling in the 2016 -- questioning why Congress and federal investigators aren't probing how the Democratic administration handled certain issues.

"Question: If all of the Russian meddling took place during the Obama Administration, right up to January 20th, why aren't they the subject of the investigation?" Trump tweeted. "Why didn't Obama do something about the meddling? Why aren't Dem crimes under investigation? Ask Jeff Sessions!"

Question: If all of the Russian meddling took place during the Obama Administration, right up to January 20th, why aren't they the subject of the investigation? Why didn't Obama do something about the meddling? Why aren't Dem crimes under investigation? Ask Jeff Sessions! — Donald J. Trump (@realDonaldTrump) February 21, 2018

Trump's tweet is his latest attack on his attorney general over Russia and special counsel Robert Mueller's probe, which returned 13 indictments against Russians last week for their alleged role in meddling in the 2016 election.

The House and Senate Intelligence Committees have interviewed numerous Obama administration officials about the election meddling, though those efforts focus on reviewing the intelligence community's assessment of Russian election interference and preventing future Russian attempts — and not "Democratic crimes" as Trump was suggesting.

But there are several investigations in Congress currently probing Obama administration incidences, including several with ties to Russia.

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