Former President TrumpDonald TrumpIran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' Ivanka Trump, Kushner distance themselves from Trump claims on election: CNN Overnight Defense: Joint Chiefs chairman clashes with GOP on critical race theory | House bill introduced to overhaul military justice system as sexual assault reform builds momentum MORE told President Joe BidenJoe BidenSchumer vows to advance two-pronged infrastructure plan next month Biden appoints veteran housing, banking regulator as acting FHFA chief Iran claims U.S. to lift all oil sanctions but State Department says 'nothing is agreed' MORE to give his “warmest regards” to Russian President Vladimir PutinVladimir Vladimirovich PutinIs America Back? A view from Europe Russia says warning shots were fired at British destroyer in Black Sea Russia deems Bard College program a threat to 'order and security' MORE ahead of the two world leaders meeting. 

Good luck to Biden in dealing with President Putin—don’t fall asleep during the meeting, and please give him my warmest regards!” Trump wrote in a statement Thursday.

Biden and Putin will have their first meeting Wednesday in Geneva, Switzerland.

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Trump was criticized during his presidency on his relationship with Putin, even from some Republicans.

He received some of his harshest criticism from the GOP when Trump sided with Putin over the U.S. intelligence community during the Helsinki summit in 2018.

During the summit, Trump refused to condemn Putin after he claimed Russia did not interfere in the 2016 election, despite U.S. intelligence agencies claiming the contrary.

The former president still claims Russia did not meddle in the 2016 election.

“Despite the belated Fake News portrayal of the meeting, the United States won much, including the respect of President Putin and Russia,” Trump said. “Because of the phony Russia, Russia, Russia Hoax, made-up and paid for by the Democrats and Crooked Hillary ClintonHillary Diane Rodham ClintonCommunion vote puts spotlight on Hispanic Catholics Trump's biggest political obstacle is Trump The Memo: Some Democrats worry rising crime will cost them MORE, the United States was put at a disadvantage—a disadvantage that was nevertheless overcome by me.”

Secretary of State Antony BlinkenAntony BlinkenPutin accuses US of organizing 2014 Ukraine coup China has declared information warfare against America — Biden must respond vigorously Envoy says US in talks to remove foreign forces in Libya ahead of elections MORE has said Biden will warn Putin during the meeting about action the U.S. will take against Russia if the country continues to implement cyberattacks against the U.S.

"I can’t tell you whether I'm optimistic or not about the results," Blinken said.  "I don't think we're going to know after one meeting, but we'll have some indications. ... We're prepared either way."