WASHINGTON >> The leaders of a congressional inquiry into Russia’s efforts to sway the U.S. election called on the Justice Department today to produce any evidence that supports President Donald Trump’s explosive wiretapping allegation.

Declaring that Congress “must get to the bottom” of Trump’s claim, Sens. Lindsey Graham, R-S.C., and Sheldon Whitehouse, D-R.I., asked Acting Deputy Attorney General Dana Boente and FBI Director James Comey to produce the paper trail created when the Justice Department’s criminal division secures warrants for wiretaps.

Trump tweeted last weekend that former President Barack Obama had tapped his phones at Trump Tower during the election. But Trump offered no evidence to back up the accusation. Through a spokesman, Obama said neither he nor any White House official had ever ordered surveillance on any U.S. citizen. Obama’s director of national intelligence, James Clapper, said nothing matching Trump’s claims had taken place.

Following Trump’s tweet, FBI Director James Comey privately asked the Justice Department to dispute the president’s claim because he believed the allegations to be false.

As the chairman and top Democrat on the Senate Judiciary crime and terrorism subcommittee, Graham and Whitehouse said they would take very seriously “any abuse of wiretapping authorities for political reasons.”

But, they added, “We would be equally alarmed to learn that a court found enough evidence of criminal activity or contact with a foreign power to legally authorize a wiretap of President Trump, the Trump Campaign, or Trump Tower.”

The senators are seeking warrant applications and court orders, which they said can be scrubbed to protect secret intelligence sources and methods.

The House and Senate Intelligence committees, and the FBI, are investigating contacts between Trump’s campaign and Russian officials, as well as whether Moscow tried to influence the 2016 election. Trump demanded that they broaden the scope of their inquiries to include Obama’s potential abuse of executive powers.

Graham and Whitehouse acknowledged Trump’s desire for the intelligence committees to have purview, but they argued that their subcommittee has oversight of the Justice Department’s criminal division.

Graham has been a frequent critic of Trump’s push for closer ties with Moscow. After Trump’s victory in November, he pledged to use his position in the Republican majority to investigate what he called “Russia’s misadventures throughout the world.”