Washington (CNN) President Donald Trump, after being criticized for his response to Russia's election meddling, challenged Attorney General Jeff Sessions to launch an investigation into the Obama administration for failing to do enough to stop the 2016 election foreign interference.

The tweet is the latest in a series where Trump faults former President Barack Obama for not doing enough to stop Russian meddling , but the first time Trump has suggested that Sessions -- the man he picked to lead the Justice Department but has maintained a grudge against for the better part of a year -- wasn't doing enough.

"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 Wednesday morning. "Why didn't Obama do something about the meddling? Why aren't Dem crimes under investigation? Ask Jeff Session!"

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 Session! — Donald J. Trump (@realDonaldTrump) February 21, 2018

Trump misspelled his longtime supporter's name: It's Sessions, not Session. He later deleted the original tweet and corrected the spelling error.

The Justice Department is tasked with investigating crimes committed in the United States, making Trump's tweet a suggestion that the former Obama administration committed a crime by not stopping Russia.