Congress President Juan Hernandez says the government is providing armored vehicles and bodyguards to the three men.
Hernandez said Monday that investigators discovered the plot while gathering intelligence on a wave of violence that has killed several people, including Honduras' top anti-money-laundering prosecutor who was shot to death last week.
Hernandez didn't give any other details of the plot or say whether police have made any arrests.
With a homicide rate of 91 per 100,000 residents, Honduras is often called the most violent country in the world. Prosecutors solve only about 20 percent of homicide cases.