President Trump on Tuesday denounced indictments against his former campaign staffers and said the Democratic Party is in a state of agitation and should focus on its own problems.

"The biggest story yesterday, the one that has the Dems in a dither, is Podesta running from his firm. What he know about Crooked Dems is ... earth shattering. He and his brother could Drain The Swamp, which would be yet another campaign promise fulfilled. Fake News weak!" Trump tweeted Tuesday morning.

Tony Podesta, brother to former Hillary Clinton campaign chairman John Podesta and founder of the Podesta Group, announced Monday he will resign from his lobbying company in response to an investigation of the firm by special counsel Robert Mueller.

It's not clear when Podesta's departure will be effective. It was reported last week Mueller had opened a federal investigation into the Democratic-leaning Podesta Group lobbying firm and its founder.

The decision to focus on Podesta was born out of Mueller's probe into whether Trump's campaign colluded with Russia.

A Podesta Group spokesman said the firm is "cooperating fully with the special counsel's office and has taken every possible step to provide documentation that confirms timely compliance. In all of our client engagements, the Podesta Group conducts due diligence and consults with appropriate legal experts to ensure compliance with disclosure regulations at all times — and we did so in this case."

Manafort and Podesta's firms worked together in a public relations campaign for the European Centre for a Modern Ukraine nonprofit, which is believed to be backed by the pro-Russian and oligarch-funded Ukrainian political group, Party of Regions.

The two are part of six firms who worked on the campaign that the special counsel is investigating.

Sources who spoke with NBC said the Podesta Group became of significant interest because it may have violated the Foreign Agents Registration Act. FARA states Americans who lobby for foreign governments, leaders, or political parties must disclose their activities with the Justice Department.

Both Manafort and Podesta's firms only filed FARA disclosures following media reports of their associations with the ECMU.