Donald Trump has said that he believes the "biggest" story on Monday - a day where three former members of his campaign team were indicted on a number of charges - was the fact that Democratic lobbyist Tony Podesta stepped down from his firm amid the Robert Mueller-led Russia probe.

Mr Podesta has stepped down from the Podesta Group amid the indictments for Mr Trump's former campaign manager Paul Manafort, his partner Rick Gates and separately, former foreign policy aide George Papadopolous.

Mr Podesta is brother of John Podesta, who served as chairman of the presidential campaign of Democratic candidate Hillary Clinton, and as a senior White House adviser to Democratic former President Barack Obama. Mr Trump has referred to both Ms Clinton and John Podesta as "crooked".

Mr Manafort, a longtime Republican operative, and Gates pleaded not guilty to a 12-count indictment with charges ranging from money laundering to acting as unregistered agents of Ukraine's former pro-Russian government.

As for Mr Papadopoulos, he is said to have been approached by people claiming ties to Russia and offering “dirt” on Ms Clinton in the form of thousands of emails, according to court documents unsealed Monday. Papadopoulos pleaded guilty to lying to FBI agents about the conversations and has been cooperating with investigators, the documents said.

The indictment against Mr Manafort and Gates listed two unnamed firms as “Company A” and “Company B” that lobbied several legislators on behalf of Ukraine at Mr Manafort's request. Podesta Group had worked with Mr Manafort in Ukraine, but the indictment did not name Podesta Group.

A spokesperson for the Podesta Group said after Mr Podesta stepped down that it had been in contact with investigators on special counsel Robert Mueller's team and was fully cooperating with the probe.

The biggest names involved in the Trump-Russia investigation Show all 17 1 /17 The biggest names involved in the Trump-Russia investigation The biggest names involved in the Trump-Russia investigation Paul Manafort Mr Manafort is a Republican strategist and former Trump campaign manager. He resigned from that post over questions about his extensive lobbying overseas, including in Ukraine where he represented pro-Russian interests. Mr Manafort turned himself in at FBI headquarters to special counsel Robert Mueller’s team on Oct 30, 2017, after he was indicted under seal on charges that include conspiracy against the United States, conspiracy to launder money, unregistered agent of a foreign principal, false and misleading US Foreign Agents Registration Act statements, false statements, and seven counts of failure to file reports of foreign bank and financial accounts. Getty The biggest names involved in the Trump-Russia investigation Rick Gates Mr Gates joined the Trump team in spring 2016, and served as a top aide until he left to work at the Republican National Committee after the departure of former Trump campaign manager Paul Manafort. Mr Gates' had previously worked on several presidential campaigns, on international political campaigns in Europe and Africa, and had 15 years of political or financial experience with multinational firms, according to his bio. Mr Gates was indicted alongside Mr Manafort by special counsel Robert Mueller's team on charges that include conspiracy against the United States, conspiracy to launder money, unregistered agent of a foreign principal, false and misleading US Foreign Agents Registration Act statements, false statements, and seven counts of failure to file reports of foreign bank and financial accounts. AP The biggest names involved in the Trump-Russia investigation George Papadopoulos George Papadopoulos was a former foreign policy adviser for the Trump campaign, having joined around March 2016. Mr Papadopoulos plead guilty to federal charges for lying to the FBI as a part of a cooperation agreement with Special Counsel Robert Mueller's investigation. Mr Papadopoulos claimed in an interview with the FBI that he had made contacts with Russian sources before joining the Trump campaign, but he actually began working with them after joining the team. Mr Papadopoulos allegedly took a meeting with a professor in London who reportedly told him that Russians had "dirt" on Hillary Clinton. The professor also allegedly introduced Mr Papadopoulos to a Russian who was said to have close ties to officials at the Russian Ministry of Foreign Affairs. Mr Papadopoulos also allegedly was in contact with a woman whom he incorrectly described in one email to others in the campaign as the "niece" to Russian President Vladimir Putin. Twitter The biggest names involved in the Trump-Russia investigation Donald Trump Jr The President's eldest son met with a Russian lawyer - Natalia Veselnitskaya - on 9 June 2016 at Trump Tower in New York. He said in an initial statement that the meeting was about Russia halting adoptions of its children by US citizens. Then, he said it was regarding the Magnitsky Act, a US law blacklisting Russian human rights abusers. In a final statement, Mr Trump Jr released a chain of emails that revealed he took the meeting in hopes of getting information Ms Veselnitskaya had about Hillary Clinton's alleged financial ties to Russia. He and the President called it standard "opposition research" in the course of campaigning and that no information came from the meeting. 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In June 2016, he wrote to Donald Trump Jr offering a meeting with a Russian lawyer, Natalya Veselnitskaya, who had information about Hillary Clinton. Mr Goldstone was the intermediary for Russian pop star Emin Agalaraov and his father, real estate magnate Aras, who played a role in putting on the 2013 pageant. In an email chain released by Mr Trump Jr, Mr Goldstone seemed to indicate Russian government's support of Donald Trump's campaign. AP images The biggest names involved in the Trump-Russia investigation Aras and Emin Agalarov Aras Agalarov (R) is a wealthy Moscow-based real estate magnate and son Emin (L) is a pop star. Both played a role in putting on the previously Trump-owned 2013 Miss Universe pageant in Moscow. They allegedly had information about Hillary Clinton and offered that information to the Trump campaign through a lawyer with whom they had worked with, Natalia Veselnitskaya, and music publicist Rob Goldstone. Getty Images The biggest names involved in the Trump-Russia investigation Natalia Veselnitskaya Natalia Veselnitskaya is a Russian lawyer with ties to the Kremlin. She has worked on real estate issues and reportedly counted the FSB as a client in the past. She has ties to a Trump family connection, real estate magnate Aras Agalarov, who had helped set up the Trump-owned 2013 Miss Universe pageant which took place in Moscow. Ms Veselnitskaya met with Donald Trump Jr, Jared Kushner, and Paul Manafort in Trump Tower on 9 June 2016 but denies the allegation that she went there promising information on Hillary Clinton's alleged financial ties to Russia. She contends that the meeting was about the US adoptions of Russian children being stopped by Moscow as a reaction to the Magnitsky Act, a US law blacklisting Russian human rights abusers. Getty Images The biggest names involved in the Trump-Russia investigation Mike Flynn Mr Flynn was named as Trump's national security adviser but was forced to resign from his post for inappropriate communication with Russian Ambassador to the US Sergey Kislyak. He had misrepresented a conversation he had with Mr Kislyak to Vice President Mike Pence, telling him wrongly that he had not discussed sanctions with the Russian. Getty Images The biggest names involved in the Trump-Russia investigation Sergey Kislyak Mr Kislyak, the former longtime Russian ambassador to the US, is at the centre of the web said to connect President Donald Trump's campaign with Russia. Reuters The biggest names involved in the Trump-Russia investigation Roger Stone Mr Stone is a former Trump adviser who worked on the political campaigns of Richard Nixon, George HW Bush, and Ronald Reagan. 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Mr Page met with Russian Ambassador to the US Sergey Kislyak during the 2016 Republican National Convention in Cleveland. Mr Page had invested in oil companies connected to Russia and had admitted that US Russia sanctions had hurt his bottom line. Reuters The biggest names involved in the Trump-Russia investigation Jeffrey "JD" Gorden Mr Gordon met with Russian Ambassador to the US Sergey Kislyak during the 2016 Republian National Convention to discuss how the US and Russia could work together to combat Islamist extremism should then-Republican presidential candidate Donald Trump win the election. The meeting came days before a massive leak of DNC emails that has been connected to Russia. Creative Commons The biggest names involved in the Trump-Russia investigation James Comey Mr Comey was fired from his post as head of the FBI by President Donald Trump. 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The spokesperson also said the Podesta Group fully complied with the law in disclosing its lobbying on behalf of the European Centre for a Modern Ukraine, a group linked to Mr Manafort and named in the indictment.

Podesta Group filed lobbying disclosures with the Department of Justice in April and August saying it did work in 2012 for the same pro-Russian Ukrainian group for which Mr Manafort had worked. Podesta Group work alongside another Washington lobbying firm, Mercury LLC, which also said on Monday that it was cooperating with Mr Mueller's team.

No charges have been filed against anyone with Podesta Group or Mercury.

Trump-Russia investigation: who has been charged in the Mueller probe

Tony Podesta did not respond to requests for comment. Mr Podesta was the head of the firm that bore his name. It did $10.7 million in lobbying in the first nine months of 2017, according to disclosures the firm filed with the U.S. Congress.

Mr Mueller's team has been investigating alleged Russian meddling in the 2016 campaign, but neither Trump nor the campaign were mentioned in the indictment against Mr Manafort and Mr Gates.

While Podesta Group is seen as a mainly Democratic lobbying firm, Mercury is viewed as mainly a Republican shop. Mercury is a subsidiary of Omnicom Group and does public relations work in addition to lobbying. Omnicom did not reply to a request for comment.