Story highlights Carter Page is a former foreign policy adviser to President Donald Trump's campaign last year

Senate investigators request information from him in a letter and Thursday he responded

(CNN) Carter Page brushed back the Senate intelligence committee in a letter Thursday, telling members that if they want details about his communications with Russians, they'll need to ask former President Barack Obama.

The former foreign policy adviser for Donald Trump's campaign, who is being scrutinized by both congressional and FBI investigators, berated the Senate intelligence committee's requests in an April 28 letter provided to CNN for details about his communications and schedule a time to be interviewed by Senate investigators.

The Senate panel has also asked for records of former campaign chairman Paul Manafort and former Trump adviser Roger Stone as part of its probe. And the panel, sources said, is prepared to subpoena them for the records if necessary.

Instead, Page, who has been strangely outspoken, wrote in his response that he was confident evidence would prove he was a target of surveillance by Obama -- evidence, he said, that would likely induce "severe vomiting" when it comes out.

"I suspect the physical reaction of the Clinton/Obama regime perpetrators will be more along the lines of severe vomiting when all the facts are eventually exposed regarding the steps taken by the U.S. Government to influence the 2016 election," Page wrote.

Read More