Transcript for New move by Democrats on the Trump investigation

Next, we move to the new moves to investigate president trump. House Democrats set to request more than 60 new documents tomorrow from people in the president's inner circle. The Democrats saying the public has the right to know, and tonight, the new poll tracking how the president is doing with the American people. Here's Tara Palmeri. Reporter: Tonight, house Democrats preparing to launch a sweeping investigation, deep into the president and his inner circle. Tomorrow, we will be issuing document requests to over 60 different people and individuals from the white house to begin the investigations to present the case to the American people about obstruction of justice, corruption, and abuse of power. Reporter: Jerry Nadler included Donald Trump Jr. And trump organization cfo Allen weisselberg among the people that will be contacted. The president of the united States thus wrote a personal check for hush money as part of a criminal scheme. Reporter: Democrats claiming the bombshell testimony of Michael Cohen showed more evidence of potential criminal behavior. All of a sudden, they're trying to take you out with . Reporter: In a two-hour speech, trump denied the charges. There's no collusion, so now they morph into, let's inspect every deal he's ever done. We're going to check his finances, his deals. We're going to check -- these people are sick. They're sick. Reporter: The president's Republican allies standing by him on impeachment. I think congressman Nadler decided to impeach the president the day he was elected. Reporter: When it comes to North Korea, the president finding less support when he said he believed Kim Jong-un about what happened with Otto Warmbier. He tells me he didn't know about it, and I will take him at his word. I think Kim knew what happened, which was wrong. Reporter: The president defending his situation. I'm in such a horrible position. I have to negotiate, and I love Mr. And Mrs. Warmbier, and I love Otto. And it's a very, very delicate balance. Tara, while the president is facing tough opposition from Democrats, he's also getting some encouraging signs from a new poll? Reporter: Tom, according to the latest poll, the president has a 46% approval rating. Within his own party, it's 90%. But it's not all positive. 60% disapprove of his decision to declare a national emergency, to build a border wall. Tom? Tara, thank you. And we're following a major

This transcript has been automatically generated and may not be 100% accurate.