(CNN)High-level advisers close to then-presidential nominee Donald Trump were in constant communication during the campaign with Russians known to US intelligence, multiple current and former intelligence, law enforcement and administration officials tell CNN.
President-elect Trump and then-President Barack Obama were both briefed on details of the extensive communications between suspected Russian operatives and people associated with the Trump campaign and the Trump business, according to US officials familiar with the matter.
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Both the frequency of the communications during early summer and the proximity to Trump of those involved "raised a red flag" with US intelligence and law enforcement, according to these officials. The communications were intercepted during routine intelligence collection targeting Russian officials and other Russian nationals known to US intelligence.
Among several senior Trump advisers regularly communicating with Russian nationals were then-campaign chairman Paul Manafort and then-adviser Michael Flynn.
Officials emphasized that communications between campaign staff and representatives of foreign governments are not unusual. However, these communications stood out to investigators due to the frequency and the level of the Trump advisers involved. Investigators have not reached a judgment on the intent of those conversations.