The former FBI director on Thursday told the Senate intelligence committee that he is “sure” that special counsel Robert Mueller is considering whether the president obstructed justice by asking Mr Comey to stop investigating former national security adviser Michael Flynn. 

For Senator Cory Booker, who tweeted that Mr Comey “established a foundation” for charging the president with a crime, that raised the prospect of using legal means to hold the president accountable. 

But the controversy over Mr Trump’s alleged interference in an FBI investigation is unlikely to be resolved in court. “The ultimate remedy is political,” says Eric Posner, a constitutional law specialist at the University of Chicago.

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