The allegation was immediately rejected by Germany's domestic spy agency (BfV) which said its chief Hans-Georg-Maaßen holds talks with members of all parties in parliament at the request of the Interior Ministry and did not pass on information illegally.
After a grilling by two parliamentary committees on Wednesday, Maaßen's direct boss, Interior Minister Horst Seehofer, threw his weight behind the embattled top spy.
Seehofer told parliament on Thursday emphatically that Maaßen "continues to have my trust in him as president of the Federal Office for the Protection of the Constitution" (BfV).
He argued that Maaßen had "a convincing position against the right-wing radicalism".
But barely hours after receiving Seehofer's ringing endorsement, new questions arose over Maaßen as AfD MP Stephan Brandner told public broadcaster ARD that the spy chief on June 13th handed him figures from his agency's latest annual report "that had not been published".
"We spoke about different figures that were in the report," said Brandner, adding that the data was related to Islamists deemed dangerous by the service as well as the agency's budget.
The BfV published its report five weeks later.
Rejecting the ARD report, a BfV spokesman said: "The report gives the impression that information or documents have been passed on illegally. That is of course not the case."
But Brandner's claim unleashed a new round of furore over Maaßen's neutrality, as it also comes after allegations that the BfV chief met several times with the AfD's leadership to give them advice on how to avoid being placed under formal surveillance by his service.
Lars Klingbeil, general secretary of Merkel's Social Democratic coalition partners, said Maaßen's position had become untenable.
"It's absolutely clear to the SPD leadership that Maaßen has to go. Merkel must take action," he tweeted.
Maaßen has been caught in the headlights after he directly contradicted Chancellor Angela Merkel in his assessment of anti-migrant protests in the city of Chemnitz.
Merkel had firmly condemned a "hunt against foreigners" backed by videos circulating on social media, but Maaßen had questioned the authenticity of at least one of the clips.
For critics, Maaßen's claim played into the hands of the far-right. Merkel's coalition partner, the centre-left SPD had called for him to step down.
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