Two US senators have written to US law enforcement to inquire if there is any evidence to support President Donald Trump’s claim that he was wiretapped.
Democratic Senator Sheldon Whitehouse and Republican Lindsey Graham sent the letter to the FBI on Wednesday.
They requested “any warrant applications and court orders… related to wiretaps of President Trump, the Trump campaign, or Trump Tower”.
Mr Trump tweeted the unsubstantiated claim over the weekend.
“Just found out that Obama had my ‘wires tapped’ in Trump Tower just before the victory,” he posted in a series of tweets on Saturday morning.
Despite repeated requests, the White House has not supplied any evidence for the claim.
It has called on Congress to look into the allegation as part of their investigation into alleged Russian meddling in the 2016 US election.
Mr Graham and Mr Whitehouse, two senior members of the Senate Judiciary Committee, also addressed Wednesday’s letter to the Department of Justice.
“Congress must get to the bottom of President Trump’s recent allegation that President Obama wiretapped President Trump’s phones during the 2016 election,” they wrote.