Curt Weldon, a Republican and former Pennsylvania congressman, lost his re-election campaign more than a decade ago following an FBI probe into his ties to two Russian companies. He has "connections to both Russia and the Trump campaign" that are raising suspicions among senators, a spokeswoman for Democratic Senator Dianne Feinstein said. Feinstein is the committee's ranking member, and wants to interview Weldon, the spokeswoman said.

The reasons for the committee's interest in Weldon are murky, but his ties to Russia are significant. Members of Congress believe, for example, that Weldon may lead to answers about why the Trump administration sought to lift sanctions on Russia in the aftermath of the 2016 election despite a public statement by intelligence agencies that the Kremlin tried to help Trump win.