Can you elaborate on what part oil prices play?
The fed has two mandates (1) keep inflation low; and (2) keep unemployment low.
When inflation goes up, the fed can raise interest rates and money comes out of the economy to pay for interest, and with less money in the economy there is less money to pay inflated prices so inflation goes down.
When unemployment goes up, the fed can lower interest rates and money goes into the economy, which creates jobs.
When oil is low, this creates deflation, that is prices get lower, because everything is cheaper. Oil is factored into the price of most goods because oil is needed to either create or transport almost everything. Further, when oil is low, unemployment goes down, because there is more money in the economy to use for other things which creates jobs. Therefore, when inflation is low, and oil prices are low, it makes no sense to raise interest rates.
The fed has raised rates by 0.25% and said they will do three to four more increases in 2019, but they have not explained why. Thus, with no other rational explanation, it is clearly a conspiracy by the academics that sit on the fed who hate trump and want to bring him down in 2020.