Roger Stone, an informal advisor to Donald Trump's campaign, is publicly suggesting that longtime Hillary Clinton aide Huma Abedin could be a 'Saudi spy' and is encouraging the candidate to raise the issue.

'She has a very troubling past,' Stone told Breitbart News Daily. 'She comes out of nowhere. She seems to have an enormous amount of cash, even prior to the time that she goes to work for Hillary,' he added.

'So we have to ask: Do we have a Saudi spy in our midst? Do we have a terrorist agent?' he asked.

Stone didn't offer any evidence for Abedin's supposed terror ties or any proof of spying. He pointed to press reports about Abedin's family history and time living in Saudi Arabia as a child.

In urging Trump to raise the issue, Stone, who has participated in bare-knuckled politics since Richard Nixon's 1972 reelection campaign, alluded to the Orlando killings that have already shaken up the 2016 race.

Secret agent? Donald Trump advisor Roger Stone is asking whether longtime Hillary Clinton (left) aide Huma Abedin (right) is a 'Saudi spy' or a 'terrorist agent'

'I also think that now that Islamic terrorism is going to be front and center, there's going to be a new focus on whether this administration, the administration of Hillary Clinton at State was permeated at the highest levels by Saudi intelligence and others who are not loyal Americans,' Stone said.

'I speak specifically of Huma Abedin, the right-hand woman, the now vice-chairman or co-chairman of Hillary Clinton's presidential campaign.'

Stone urged Trump to start raising the issue. 'The only way it’s going to cross over into the mainstream, the only way people are going to focus on it is if Trump himself raises the question,' he said.

'It's not just Huma. It's her mother and her father who are, who are hardcore Islamic ideologues,' he said. There aren't any comments in the public record of Huma Abedin making hardcore Islamic ideological statements. She has offered very few pronouncements over her career as a behind-the-scenes operative, although she did weigh in on Twitter after Republican presidential candidate Ben Carson said a Muslim shouldn't be in charge of the country.

'You can be a proud American, a proud Muslim, and proudly serve this great country. Pride versus prejudice,' Abedin tweeted in response to the comment.

Advisor Roger Stone wants Donald Trump to start raising the issue of Abedin's family ties

Stone has participated in bare-knuckled politics since Richard Nixon's reelection

'I'm not talking about her personal relationship at this point – I'm talking about her political relationship,' Stone continued.

Stone said he thought Abedin would be a 'major issue' in the campaign. She is married to ex-Rep. Anthony Weiner, who quit Congress after a sexting scandal. She appears frequently in the thousands of emails Clinton handed over to the State Department after it was revealed she was using a personal account and a home server while serving as secretary of state.

'Who is this woman? Where did she come from? I think that is going to be a major major issue and what is her relationship with Hillary Clinton? I think this all gets adjudicated in this campaign,' Stone said.

Stone alluded to press reports including a February Vanity Fair article that examined her late father, Syed Zainul Abedin's ties to the Institute of Minority Muslim Affairs, a think tank, and served as editor of the Journal of Muslim Minority Affairs.

National review columnist Andrew McCarthy, a former assistant U.S. attorney, claims the publication is a mouthpiece for the Muslim Brotherhood.

The article claimed that the Abedin family moved to Jidda, Saudi Arabia, when Abedin was two with the backing of Abdullah Omar Nasseef, president of King Abdulaziz University. McCarthy in 2012 called Nasseef a 'major Muslim Brotherhood figure involved in the financing of al-Qaeda.'

Abedin got her start working for Clinton when the candidate was first lady. She later followed her to the Senate and the State Department

Former Republican Rep. Michele Bachmann wrote the State Department about Abedin's alleged ties, and was rebuked my many prominent Democrats and Republicans, including Republican Senator John McCain of Arizona.

'Put simply, Huma represents what is best about America: the daughter of immigrants, who has risen to the highest levels of our government on the basis of her substantial personal merit and her abiding commitment to the American ideals that she embodies so fully,' McCain said then. He added: 'I am proud to know Huma and to call her my friend.'

Stone also raised the accusations in a post on Breitbart.

'Chic gal pal? Mild mannered politician’s wife? Harmless clotheshorse? Saudi plant? Innocent aide? Handler?' he asked.

Abedin was born in Kalamazoo Michigan, the child of two academics. Her father was born in New Delhi, India, while her mother was from Pakistan. She attended George Washington University and was a board member of a Muslim students association.