Transcript for Trump may face onslaught of probes if Democrats take the House

As Jon pointed out, the white house is prepared for whatever happens tonight. The president said he couldn't campaign for everyone, after all. And tonight, the Democrats are projecting confidence. They like the turnout,particularly when it comes to their chances of taking over the house. When Nancy Pelosi was asked if he's 100% sure of victory tonight, she answered, yes, I am. We have one more question on this tonight. We have Mary Bruce here. We're going to show everyone the tool we'll have all night long here on election night. Here's the magic number for the Democrats. They have to flip 23 seats in the house. They have to pick up two seats in the senate. Many believe that's going to be an uphill battle if they try for that. But at least when it comes to the house, if that happens for the Democrats, how would life change for this president for the white house? Reporter: Well, if Democrats do take the house, the president is going to face an onslaught of investigations. Democrats are likely to dig into everything from conflicts of interest to the president's tax returns. And they're likely to take steps to protect Robert Mueller. As for that big question of impeepment, they want to see what Mueller has first. He said, I don't care. The president telling our team, quote, Democrats can do whatever they want and I can do whatever I want. All right, Mary Bruce, you'll be with us. We'll be joining George and the entire team at 8:00 P.M. Eastern here on ABC, with all of the results. Impossible to predict what will infold tonight, but we'll be right here with us.

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