Vice-President Mike Pence has hired an outside lawyer to handle his response to inquiries into possible ties between President Trump’s campaign and Russia.
Richard Cullen is known for representing high profile clients.
Earlier, US media reported that Donald Trump was being investigated by special counsel Robert Mueller for possible obstruction of justice.
Mr Mueller is leading an FBI inquiry into Russia’s alleged meddling in the 2016 presidential election.
Reports in US media said senior intelligence officials would be interviewed on whether Mr Trump tried to end an inquiry into his sacked National Security Adviser Michael Flynn, and about the firing of FBI chief James Comey.
Mr Trump – who has repeatedly denied any collusion with Russia – said the move was the latest action in a “phony story”.
“You are witnessing the single greatest WITCH HUNT in American political history – led by some very bad and conflicted people!” the US president tweeted.
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