Former Donald Trump campaign foreign policy aide George Papadopoulos plans to push back against federal investigators in congressional testimony Thursday – and plans to argue the FBI and British intelligence tried to 'infiltrate' the campaign.

Papadopoulos pleaded guilty to lying to the FBI as part of the Robert Mueller investigation, and was sentenced to two weeks in prison.

He is using his Twitter account to launch increasingly aggressive attacks on investigators and former U.S. intelligence officials, and will tell Congress behind closed doors about what he calls a 'political scandal' of trying to 'sabotage' the campaign.

Former Donald Trump campaign foreign policy aide George Papadopoulos is set to testify Thursday about what he calls a plot to 'infiltrate' the Trump campaign

He has appeared on conservative pundit Sean Hannity's Fox News show and retweeted influential conservative voices like Rep. Mark Meadows of North Carolina.

'I didn't want to have to expose the biggest political scandal in modern history,' Papadopoulos tweeted last week. 'I was happy living on the Greek islands. But, guess life works in mysterious ways and I am happy I was called.'

In another tweet this week, he wrote: 'Americans are not morons. You couldn't expect a guy (me) who was linked into western diplomatic circles,and never knowingly met a Russian official, to all of a sudden be a patsy for a 'Russia' conspiracy. My set up was carefully orchestrated.'

He called for top U.S. news outlets to 'take on what should be the story of the century. The Trump campaign was infiltrated by western intelligence and sabotaged.'

According to a letter from his lawyer Caroline Polisi reviewed by the Atlantic, Papadopoulos will testify about nine individuals, several of whom are among the most enigmatic of the Russia probe.

Among them is the Maltest professor Joseph Mifsud identified as the person who claimed the Russians had dirt on Hillary Clinton. Mifsud has disappeared, although his lawyer sent the Associated Press a photo indicated he was in Zurich as recently as May.

George Papadopoulos joins the Hot Topics table on The View. He has taken on investigators in public appearances

Foreign policy advisor to US President Donald Trump's election campaign, George Papadopoulos and his wife Simona Mangiante Papadopoulos arrive at US District Court for his sentencing in Washington, DC on September 7, 2018

He will also discuss Belarus businessman Sergei Millian and Cambridge University professor Stefan Halper, an FBI source who made contact with Trump officials including Papadopoulos during the campaign.

He told the publication he thinks he came under scrutiny because he had 'energy business ties to Cyprus and Israel that threatened British interests.'

'Do you really think someone like me who had no connection at all to Russia would just randomly run into the one guy on the planet who apparently had the keys to the kingdom regarding a massive conspiracy?' he asked.

Papadopoulos, who Team Trump derided as a mere 'coffee boy' after his indictment and arrest, appeared at a gathering of Trump's foreign policy team where the idea of a visit to meet Russian President Vladimir Putin was discussed.

He plans to discuss his contacts with Maltese professor Joseph Mifsud, who has disappeared

His Italian wife Simona Mangiante has said Papadopoulos was the victim of a 'setup'

He has launched a GoFundMe campaign for legal costs, with about $9,000 contributed so far.

It says Papadopoulos, a 'young man who has devoted his bright career to serve his country and help Donald Trump to become our President, has been the victim of the biggest plot in American political history.'

'While honestly working for the Trump campaign, he became the target of many shady forces to sabotage the President,' according to his site. 'He had a brilliant career that was violently interrupted.'

Papadopoulos also used twitter to go after former Director of National Intelligence James Clapper. He wrote: 'James Clapper is currently in Australia colluding with their government to cover both his and [former diplomat] Alexander Downer's involvement in the most profound, and illegal, spying operation against an American and the presidential campaign he worked for in history. Bad look Australia.'

Downer reported to the U.S. information he learned from a May 2016 meeting with Papadopoulos at a London bar where the aide said the Russians had dirt on Hillary Clinton, helping start a counterintelligence investigation.