Rudy Giuliani said President Trump would be “walking into a trap” if he agreed to be interviewed by the special counsel unless Robert Mueller’s investigators come clean on the role of an informant who met with Trump campaign associates in 2016, according to a report on Sunday.

“What we intend to do is premise it on, ‘If you want an interview, we need an answer to this,’” Giuliani, who’s representing Trump in the Russia investigation, told the Wall Street Journal in an interview published on Sunday.

The former mayor of New York City said Trump’s legal team would have to know whether the FBI informant compiled “incriminating information” about the aides.

The person, identified by numerous news outlets as Cambridge professor Stefan Halper, met with campaign aides Carter Page, George Papadopoulos and Sam Clovis in the summer of 2016.

Clovis and Page have testified before grand juries and Papadopolous pleaded guilty in October 2017 to lying to the FBI about his contacts with Kremlin-linked Russians and is cooperating in the Mueller probe .

Page had also been monitored for years by the FBI for his contacts with Russians.

Trump, his legal team and some Republicans in Congress have been using the revelation of the informant to raise questions about the legitimacy of Mueller’s investigation, suggesting that it was prompted by a political motives in the Obama administration.

The president in a tweet on Saturday hinted at that possibility.

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“If the FBI or DOJ was infiltrating a campaign for the benefit of another campaign, that is a really big deal. Only the release or review of documents that the House Intelligence Committee (also, Senate Judiciary) is asking for can give the conclusive answers,” he said.

Congressional Republicans are seeking records from the Department of Justice about the informant and other details about the investigation into Trump’s campaign.

FBI Director Christopher Wray has cautioned against outing informants, saying “the day we can’t protect human sources is the day the American people start becoming less safe.”