Washington (CNN) Former Trump campaign foreign policy adviser Carter Page struggled to explain Tuesday how he could be an informal adviser to the Kremlin and also advise an American presidential campaign.

Last week, Time magazine reported that Page bragged about being an informal adviser to the Kremlin in a 2013 letter to an editor reviewing his manuscript submitted for publication.

ABC's "Good Morning America" anchor George Stephanopoulos pressed Page on the two roles as part of why law enforcement may have targeted him for surveillance under the Foreign Intelligence Surveillance Act. A controversial Republican intelligence memo released last week highlighted that Page had been targeted.

"You can understand how that would raise questions and could lead to probable cause," Stephanopoulos said. "On the one hand, at one point you say you're an adviser to the Kremlin. Then you're an adviser to Donald Trump."

"Look, the probable cause, based on all the evidence that keeps dripping out and now has been substantiated with the Friday, you know, first memo, is that it was based on dodgy dossier which was, you know, a political stunt," Page responded.

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