President Trump's longtime political ally Roger Stone has refused to provide documents requested by the Senate Judiciary Committee and has invoked his Fifth Amendment right in declining to testify, the panel's top Democrat, Sen. Dianne Feinstein, said Tuesday.

The backdrop: This comes after Trump praised Stone, a target in special counsel Robert Mueller's Russia investigation, for having “guts" by refusing to testify against him. Stone has come under scrutiny for possibly acting as an intermediary between the Trump 2016 campaign and WikiLeaks, allegations that he denies. Feinstein said the committtee was seeking "communications related to hacked emails, communications with Russian hackers or Wikileaks, and communications with the Trump campaign." But Stone's attorney argues that the request is "far too overbroad, far too overreaching, far too wide ranging."