Former U.S. National Security Adviser Michael Flynn (C) leaves the federal court following his plea hearing in Washington D.C., the United States, on Dec. 1, 2017. (Xinhua/Ting Shen)

President Trump's decision will bring an end to Michael Flynn's dramatic criminal case, three years after he pleaded guilty to lying to the FBI about his contacts with Russia during Trump's presidential transition period in 2016.

WASHINGTON, Nov. 25  -- U.S. President Donald Trump on Wednesday announced he has pardoned Michael Flynn, his former national security adviser who pleaded guilty to lying to the Federal Bureau of Investigation (FBI).

"It is my Great Honor to announce that General Michael T. Flynn has been granted a Full Pardon," Trump tweeted, congratulating the retired Army lieutenant general while wishing him "a truly fantastic Thanksgiving."

Flynn reacted by tweeting "Jeremiah 1:19," a Bible verse alluding to a holy rescue.

The president's decision will bring an end to Flynn's dramatic criminal case, three years after he pleaded guilty to lying to the FBI about his contacts with Russia during Trump's presidential transition period in 2016 and pledged cooperation with the investigation into alleged Russian meddling in the 2016 U.S. election.

Flynn's assistance in the Russia probe led by former Special Counsel Robert Mueller delayed his sentence, as D.C. District Judge Emmet Sullivan allowed him to complete his cooperation, including appearing for congressional testimonies.