The director of national intelligence and head of the NSA will speak with investigators. The NSA's former deputy director will also be interviewed.
The FBI's Mueller is seeking interviews with three high-ranking intelligence names, suggesting a probe of Trump’s actions, the NYT reported.
Special counsel Robert Mueller's investigation of Russian interference in the 2016 election has widened, The Washington Post reported, citing officials.
An official explained that there are two possible reasons why Dan Coats and Michael Rogers repeatedly declined to answer questions from senators on Wednesday.
President Trump reportedly asked DNI Coats to get former FBI chief James Comey to ease a probe into Mike Flynn.
"On this topic, as well as other topics, I don't feel it's appropriate to characterize discussions and conversations with the president," Coats said, NBC News reports.
The announcement comes as the president-elect has criticized American intelligence agencies.
Republicans won key Senate races as Democrats have only been able to flip two seats in Illinois and New Hampshire.