Transcript for Trump calls midterm elections 'very close to complete victory'
The president very happy with the senate, picking up seats there. Democrats he campaigned against defeated. But in the house, the Democrats taking back control, and today, a combative news conference from the president, during which the president said that he's willing to work with the Democrats, but if they investigate him, it would all, quote, grind to a halt. Mary Bruce back on the hill tonight. Reporter: Even though Republicans lost the house, president trump today declared the midterm elections another big win. I'll be honest, I thought it was a very close to complete victory. Reporter: In his feisty news conference, the president noted voters rejected Republican candidates who kept him at arm's length. Mia love gave me no love. And she lost. Too bad. Peter Roskam didn't want the embrace. Eric Paulsen didn't want the embrace. They did very poorly. I'm not sure that I should be happy or sad, but I feel just fine about it. Reporter: But now, for the first time in his presidency, congressional Democrats have power. Thanks to you, tomorrow will be a new day in America. Reporter: Today, the president extending an olive branch to Nancy Pelosi, who will likely become the next speaker of the house. You know, she loves this country, and she's a very smart woman. She's done a very good job. Reporter: Pelosi and the president are pledging to work together, but trump knows full well house Democrats have something else in mind, too. They want to hold his administration accountable, now armed with the power to sub Bina, Democrats are poised to launch an onslaught of investigations. The president says if that happens, he'll go after them, with help from the republican-led senate. They can play that game, but we can play it better. Because we have a thing called the United States senate. And all you're going to do is end up in back and forth and back and forth and two years is going to go up and we won't have done a thing. Reporter: The president says he's willing to work with Democrats on issues like health care and infrastructure, but any bipartisanship would grind to a halt if they investigate him. Can you compartmentalize that and still continue to work with them for the benefit of the rest of the country? Or are all belts off? No. No. If they do that, all of it is a war-like posture. Pelosi today unfazed. They do note intent to abandon our relinquish our responsibiliies for accountability, for oversight and the rest. Mary Bruce with us live from the hill tonight. And Mary, Nancy Pelosi poised to become speaker again, we'll see. She was asked today if house Democrats will move to get the president's tax returns. Reporter: Yeah, and David, leader Pelosi said if they go down this path, the Democrats, quote, are going to know what we're doing and do it right. Democrats are already preparing to ask the irs and the trump administration to turn over these documents. They do not need a subpoena for this, but the president, asked about this again today, gave no indication that he's going to just hand over his tax returns any time soon. David? Mary Bruce after a long night last night, back on the hill tonight. Mary, thank you.
This transcript has been automatically generated and may not be 100% accurate.