Transcript for Trump campaign ad pulled from airwaves
As we've seen both parties making their final case for votes with a last-minute blitz of TV ads, but some are criticized for going too far like one from the trump campaign pulled off the airwaves. Our senior congressional correspondent Mary Bruce is here with more. Reporter: Good morning, robin. It is impossible to ignore them. Those campaign ads inundating your radio and TV. These are already the most expensive midterm elections in U.S. History and now even on election day the campaigns, both parties still spending big hoping to get you to the polls. There's something special happening. Reporter: In these final hours an all-out push for votes on the airwaves. A surge of last-minute ads. But as an American who is deeply concerned with the direction of our nation. Reporter: Former New York mayor Michael Bloomberg giving Democrats a boost, a $5 million ad buy. We must send a signal to Republicans in Washington that they have failed to lead. Reporter: The expected total spent this election cycle, a whopping $5.2 billion. Democrats raising just under 1.5 billion. Republicans more thank 1 billion. Some ads have gotten fierce. The screaming, the violence, the smears and death threats. The far left moving to socialism. Reporter: Others folksy. ??? On the road again ??? ??? just can't wait to get on the road again ??? Reporter: With 48 hours to go, Texas Democrat Beto O'rourke released this ad featuring Willie Nelson. President trump also got in on the game but it was criticized for being so racist and offensive now both NBC and fox News have stopped airing it and we won't air it here. On the campaign trail, Monday, president trump said he was unaware of the controversy. Even though he tweeted the video last week. A lot of things are offensive. Your questions are offensive a lot of times. Reporter: What are most of these ads focusing on? Health care is the most mentioned issue, more so in democratic ads while Republican ads are more likely to talk about taxes. What's the impact of all these ads? Is any one group going to benefit more than the other? In these final weeks Democrats have been seeing a huge surge of cash and Republicans that we've talked to are genuinely concerned they can't keep up and think this is one of the things that may cost them the house majority. Thank you. The voters are turning out.
This transcript has been automatically generated and may not be 100% accurate.