John Podesta admonished President Trump on Friday after the president targeted the former Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE campaign chairman in a tweet during the Group of 20 summit in Germany.

Podesta called Trump a "whack job" in a series of tweets, saying he was on a road trip with his wife when he saw Trump's early morning Twitter post mentioning him.

2/ Pulled in for a pit stop in E. Fairmont W. Va. to see that our whack job POTUS @realDonaldTrump is tweeting about me at the G20. — John Podesta (@johnpodesta) July 7, 2017

Trump claimed earlier Friday in a tweet that Podesta and Democratic National Committee (DNC) email leaks were the talk of the G-20 meeting in Hamburg, Germany.

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"Everyone here is talking about why John Podesta refused to give the DNC server to the FBI and the CIA. Disgraceful!" Trump tweeted.

Podesta noted Friday that he had "nothing to do with the DNC." The group faced a breach last summer that led to a massive release of emails from Democratic Party officials. Emails from the then-Clinton campaign chairman were released separately, months later.

Podesta on Friday accused Trump of refusing to accept the U.S. intelligence community's assessment that the Russian government sought to influence the 2016 election in his favor by launching a hacking campaign aimed at damaging Clinton's White House bid.

"Get a grip man, the Russians committed a crime when they stole my emails to help get you elected President," Podesta wrote, calling on Trump to mention the issue during his meeting with Russian President Vladimir Putin on Friday morning.

3/ Get a grip man, the Russians committed a crime when they stole my emails to help get you elected President. — John Podesta (@johnpodesta) July 7, 2017

4/ Maybe you might try to find a way to mention that to President Putin. — John Podesta (@johnpodesta) July 7, 2017

5/ BTW, I had nothing to do with the DNC. — John Podesta (@johnpodesta) July 7, 2017

Podesta finished off his broadside against Trump by urging him to focus on the G-20 summit, rather than commenting on the ongoing controversies surrounding his administration back in Washington.

6/ God only knows what you'll be raving about on twitter by the time we get to Utah. — John Podesta (@johnpodesta) July 7, 2017

7/7 Dude, get your head in the game. You’re representing the US at the G20. — John Podesta (@johnpodesta) July 7, 2017

Trump has become increasingly critical of former President Obama and other Democrats in recent weeks, arguing that party leaders and government officials failed to address Russian meddling in the election after being made aware of the efforts last August.

A special counsel and several congressional committees are currently investigating the Kremlin's role in the election, as well as possible collusion between Trump's campaign and Russian officials.

Trump has denied allegations of collusion and has cast the investigations as a "cloud" hanging over his administration.