The FBI secured a warrant last year to monitor the communications of Carter Page, a former election campaign adviser to President Donald Trump , the Washington Post reported on Tuesday.

Dec 2016: Carter Page, a former foreign policy adviser to President Donald Trump during the election campaign, makes a presentation during his visit to Moscow.

Page, who was previously a former investment banker in Moscow, was believed to have acted "as an agent of a foreign power, in this case Russia," U.S. officials told the newspaper.

The Foreign Intelligence Surveillance Act (FISA) warrant was one of the strongest pieces of evidence that indicated a Trump adviser was in touch with Russian agents during the 2016 presidential campaign, the Washington Post said.

Page has denied any wrongdoing, according to the report.

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