Connecticut's congressional delegation said Monday they want to talk to the second whistleblower that has come forward on the Ukraine scandal.

The new whistleblower says they have firsthand knowledge of President Donald Trump's dealings with Ukraine, and attorneys said multiple whistleblowers are prepared to join the chorus.

Rep. Jim Himes, who sits on the House Intelligence Committee, says he wants to force Trump's personal lawyer, Rudy Guiliani, to testify before Congress.

"It's a little hard to know what the second whistleblower has because we haven't actually seen the complaint," he said.

President Trump pressured Ukraine's leader to investigate his main political rival, Joe Biden, over his son's business dealings in the country. He and Giuliani also pushed Ukraine to investigate widely debunked conspiracy theories about the 2016 election.

The White House says, "It doesn't matter how many people decide to call themselves whistleblowers about the same telephone call -- a call the president already made public. It doesn't change the fact that he has done nothing wrong."

Sen. Chris Murphy says he does not know how important it is to have another whistleblower, "because the president has admitted to trying to get Ukraine to interfere in the 2020 election. He has publicly called on China to help him destroy the Clintons and the Bidens."

"I think we need to talk to Rudy Giuliani," said Rep. Himes. "This guy was running a one-person ambassadorial effort for the political benefit of the president. We need to understand exactly what he was doing, who he was talking to, and what kind of promises he was making."

Sen. Richard Blumenthal thinks Democrats should push for the impeachment vote.

"The politics really have to be disregarded," he said. "Whether it is to anybody's political disadvantage, the House has a responsibility. It's a moral, but it's also a constitutional, responsibility."

Guiliani is resisting those calls to come before Congress.