Former National Security Adviser Michael Flynn heads to court on Tuesday with best wishes from President Trump.

Ahead of Flynn's sentencing for lying to the FBI, Trump wrote on Twitter, "Good luck today in court to General Michael Flynn." Trump added that it will be "interesting to see what he has to say" about Russian collusion and "our great and, obviously, highly successful political campaign." He also contended that Flynn has had "tremendous pressure" put on him.

Good luck today in court to General Michael Flynn. Will be interesting to see what he has to say, despite tremendous pressure being put on him, about Russian Collusion in our great and, obviously, highly successful political campaign. There was no Collusion! — Donald J. Trump (@realDonaldTrump) December 18, 2018

Flynn last year pleaded guilty to lying to federal investigators about his conversations with Russian Ambassador Sergey Kislyak in 2016. His lawyers have recently put forth the argument that he was not given adequate warning about the consequences of lying during his FBI interview, while prosecutors have responded that lying to the FBI is not something Flynn should need to be warned not to do, per The Associated Press. Special Counsel Robert Mueller on Monday released notes from Flynn's FBI interview showing that he made false statements about his conversations with Kislyak.

Mueller has recommended a light sentence for Flynn due to his cooperation, and according to CNN, he may walk away with no jail time at all. Brendan Morrow