From the New York Times:
On Wednesday, the top Republican and Democrat on the Senate’s Judiciary Subcommittee on Crime and Terrorism asked the F.B.I. and the Justice Department for evidence that the government had sought legal permission to tap Mr. Trump’s phones.
The request came in a letter from Senators Lindsey Graham, Republican of South Carolina, and Sheldon Whitehouse, Democrat of Rhode Island, to Mr. Comey and the acting deputy attorney general, Dana Boente. Mr. Boente is overseeing the Russia inquiry because Attorney General Jeff Sessions recused himself from any cases involving the Trump campaign and Russia, after acknowledging he met with Russia’s ambassador, Sergey I. Kislyak.
“We request that the Department of Justice provide us copies of any warrant applications and court orders — redacted as necessary to protect intelligence sources and methods that may be compromised by disclosure, and to protect any ongoing investigations — related to wiretaps of President Trump, the Trump campaign or Trump Tower,” the senators wrote.