Senate Chairmen Say Ukraine Meddling 'Not Debunked', Demand Docs From DNC Contractor  https://t.co/mmLk6LL2db
### Instruction: What is the sentiment of this news? Please choose an answer from {negative/neutral/positive}
### Input: Senate Chairmen Say Ukraine Meddling 'Not Debunked', Demand Docs From DNC Contractor  https://t.co/mmLk6LL2db
### Response: neutral